Fitbit Air just made the dual-wear wrist mainstream

On 7 May 2026, Google did something the wearable industry had been edging toward for several years. They announced a wearable with no screen at all. The Fitbit Air weighs twelve grams, costs ninety-nine dollars, and is twenty-five percent smaller than the smallest Fitbit ever made before it. The bet is that a meaningful share of users want a different relationship with their wrist than the one a smartwatch offers, without making the smartwatch wrong for those who love it. What it is missing, deliberately, is a display. That choice opens a different relationship with the wrist than the smartwatches that came before it, without making either approach better or worse. Within four weeks of the announcement, the watch press, the tech press, Reddit, Threads, and Instagram were documenting an unexpected behaviour pattern: Fitbit Air owners threading the tracker onto the same strap as their automatic watches. The wrist had quietly decided what it wanted. Smartlet was built for exactly that wrist.

A new kind of wearable joins the wrist

I have been watching the wearable category for years now, partly because I run a company that depends on understanding where it goes next, partly because the category fascinates me as a sociological experiment. The first ten years of wearables were defined by the assumption that the wrist needed a screen. Apple Watch, Pixel Watch, Galaxy Watch, every Fitbit before this one. The screen was the thing. The screen was supposed to replace the phone, augment the phone, or become a smaller version of it on the wrist.

That direction has worked beautifully for a substantial share of users. Apple Watch, Pixel Watch, and Galaxy Watch have built large and loyal audiences who genuinely value notifications on the wrist, integrated apps, and the screen as a constant interface. The smartwatch is not a failed category. It is a category that found its real market and grew into it. It also turns out that another, distinct market exists alongside it. A growing number of people want health data and activity tracking without the screen, the charging anxiety, or the constant low-grade pull of notifications. For these wearers, the smartwatch has always been slightly more than they wanted. The Fitbit Air is built for that second market.

What is interesting about the Fitbit Air is that Google appears to have noticed. The Air is the first major-brand wearable to abandon the screen on purpose, not as a cost-cutting compromise but as a design conviction. The Whoop tried this first, several years ago, with mixed commercial success. The Oura Ring made the same bet on a finger. The Fitbit Air takes the same logic and puts it on the wrist at a price point that finally makes the experiment accessible to people who are not already wearable enthusiasts.

The thing this changes is not the technology. The sensors in the Fitbit Air are not dramatically more advanced than what was already in the Fitbit Charge 6. The thing it changes is the philosophy. For the first time in a decade, a major wearable brand is saying out loud that the screen is optional, depending on what the wearer actually wants the device to do.

What the Fitbit Air actually is

Strip away the launch marketing and the Fitbit Air is a small bean-shaped sensor pebble that sits flush against the underside of your wrist, held in place by an interchangeable textile or silicone strap. According to Google's own launch documentation, the device measures roughly 36 by 18 by 8 millimetres (about 1.4 by 0.7 by 0.3 inches in Google's own specs), weighs 12 grams without the band, lasts up to seven days on a charge, and recovers a full day of battery from a five-minute top-up.

The sensors track heart rate 24/7, skin temperature, blood oxygen saturation, heart rate variability, sleep stages, and resting heart rate. Android Central's launch review notes that activity detection is fully automatic, which is to say the device figures out when you are running or cycling without being told. Water resistance is rated to fifty metres. There is no display at all, no notifications, no haptic alerts beyond a discreet vibration confirming setup. Everything the device gathers is consulted later, in Google's health app on your phone, at a moment of your choosing.

The launch price of ninety-nine dollars includes the tracker, one fabric strap, and a three-month trial of Google Health Premium. Additional straps, ranging from textile to silicone, start at $34.99. The strap is held by a stainless steel buckle, which is the only metal external component of the device. Woman & Home's ten-day review notes that the device is so light and so small that the wearer routinely forgets it is there, which is essentially the point.

This is a product that has, in a real sense, accepted that the wrist's most valuable real estate is not visual but sensory. It collects data passively, asks for nothing, displays nothing, and lets you check in when you want to.

The wrist problem nobody had quite framed yet

Here is the part of the story that has been quietly building for several years, and that the Fitbit Air now brings into sharper focus.

A growing number of people want to track their health, their sleep, their heart, and their movement, while also continuing to wear the mechanical watch that means something to them. They do not want to choose. They do not want to put the Patek in the drawer to wear an Apple Watch instead. They do not want to feel like the mechanical watch is a weekend luxury and the smartwatch is a weekday tool. They want both, at the same time, on the same wrist if possible.

The conventional answer to this has been roughly "wear one on each wrist," which works well for some people and less well for others. For wearers who do not mind something on both wrists, the dual-wrist setup is genuinely fine. For wearers who type a lot, write a lot, or do close work, the non-dominant wrist gradually starts to feel cluttered, and the wearable ends up worn less than initially intended. Both outcomes are common. Neither is wrong.

The Fitbit Air, because of its size and its screenless design, makes a different solution available for the first time. The device is small enough, light enough, and discreet enough that it can sit underneath a mechanical watch, on the same wrist, without interfering with the watch's geometry or visual presence. You can wear both. They occupy different sides of the same wrist. The mechanical watch faces up, the wearable faces down. Nobody who is not looking specifically for it would notice the wearable at all.

This was technically possible before, but uncomfortable. The Whoop band could be tucked under a watch but required two separate bands. The Apple Watch was too thick to share wrist real estate. The Fitbit Air's twelve-gram screenless pebble changes the geometry. For the first time, a wearable exists whose form factor was inadvertently designed to share wrist real estate with a mechanical watch.

The week the vision became impossible to ignore

The four weeks after the Fitbit Air announcement did something I had not quite expected, even as someone whose company has been arguing for this configuration for the past three years. The tech press, the watch press, and a meaningful share of social media simultaneously discovered that you could thread an automatic watch and a Fitbit Air onto the same strap, on the same wrist, with both visible to the wearer without the geometric awkwardness of two separate bands.

On 4 June 2026, Andrew Romero wrote in 9to5Google that "Fitbit Air owners are placing automatic watches on the same strap as the tracker, and it's easy." The piece walks through a four-step tutorial, cites a megathread on r/Watches titled "double_wristing_is_the_fitbit_air_the_solution_to," and reproduces photos from Dan Seifert on Threads showing his 20mm-lug watch riding on a Fitbit Air strap, plus an Instagram creator who 3D-printed a custom adapter for his Casio. Within days, T3 and Lifehacker published variations of the same article. The framing was almost identical across all of them: this is a fun do-it-yourself project, here is how to attempt it, and yes, it works with a Rolex or an Omega if you have the lug width.

I read those articles with the slightly disorienting feeling of seeing an argument you have been making professionally for several years suddenly arrive in mainstream tech publications as a discovery. The 9to5Google headline, in particular, captures the moment with admirable accuracy. People wanted this. They were not waiting for permission. They were going to make it happen with NATO straps, single-pass threading, and 3D-printed adapters until somebody built the right hardware for the configuration.

What the DIY tutorials concede, almost as a footnote, is that the improvised solution has limits. The 9to5Google piece notes that "strap choices are limited" and that the 18mm Fitbit Air strap leaves "a gap" on 20mm-lug watches. The Casio 3D-printed adapter is a one-off project by a single creator. The Reddit thread is full of users asking whether their specific watch lug width will work, whether the Fitbit Air sensor will read accurately when squeezed against a metal case, and whether the assembly will hold up to daily wear. The DIY answer is "probably." The engineered answer is what Smartlet has been quietly shipping for three years.

Where Smartlet fits, exactly

I should now declare an interest, which I have referenced in earlier essays but should make explicit here because the Fitbit Air launch directly relates to what my own company does.

Smartlet is a modular strap system built around a single observation that turns out to apply more broadly with each passing year: the wrist increasingly carries both a mechanical watch and a connected device, and there is no good engineered answer for how those two objects coexist. The conventional answer (two straps, two wrists) does not work for most people. The proprietary answer (Apple Watch with its own ecosystem of bands) locks you into a single brand. The improvised answer (a Whoop tucked uncomfortably under a watch with two awkward bands) is what people actually do, until they stop.

What Smartlet does is treat the spring-bar interface between the lugs of nearly every watch case as the universal mechanical standard it actually is. Our adapter fits between the lugs of most compatible watch cases using our own SS316L spring bars with a proprietary quickfit mechanism. A single strap, threaded through the adapter, holds both the mechanical watch on top and the connected device on the underside. No modification to the watch. No proprietary lug system locking you into a single brand. Two wearables, one wrist, one strap, one geometry that finally makes the dual-wear configuration look intentional rather than improvised.

The Fitbit Air, in this framing, is one of the most natural devices ever made for the underside slot. Its twelve-gram weight does not affect the wrist's centre of mass. Its screenless design means no light, no visual interference, no edge that catches on the wrist bone. Its sensor surface is exactly where you would want a sensor surface to sit, which is to say flush against the underside of the wrist where blood vessels are closest to the skin. The combination of a Smartlet adapter and a Fitbit Air arrives at a result that, for once, does not feel like a workaround. It feels like the answer to a question the wearable industry had not yet asked out loud, partly because most of its products were aimed at a different use case.

The honest comparison with the DIY single-pass NATO method is worth making, because that is the configuration most readers will encounter first through the recent press tutorials. The NATO approach works as a starting point. The strap threads through the watch spring bars, the Fitbit Air sits underneath, the whole assembly holds together. What it does not do is sit cleanly. The 18mm Fitbit Air strap leaves visible gaps on 20mm-lug watches. The watch tends to drift slightly along the strap during the day. The Fitbit Air sensor presses against whatever band material happens to be between it and the skin, which is fine for nylon and less ideal for thicker materials. The look, charitably, is enthusiast-craft. Smartlet was engineered specifically to remove these compromises: properly machined lug fitment, the right strap geometry for the dual-wear configuration, a sensor cavity that lets the Fitbit Air read directly against the wrist rather than through fabric. Same idea. Different execution. The execution is the part that determines whether you still wear the assembly a month later.

Three configurations that actually work

For anyone who has bought a Fitbit Air and is now trying to figure out how to wear it alongside their mechanical watch, the options come down to three configurations, each with trade-offs worth understanding.

The simplest configuration is the dominant-and-non-dominant arrangement. Mechanical watch on the dominant wrist, Fitbit Air on the other. This works well for people who do not mind wearing something on both wrists, and for many wearers it is the right setup. The drawback for those who find the non-dominant wrist distracting during typing or writing is that the wearable can become something you remove during work and forget to put back on. Whether this is an issue depends entirely on your daily routine.

The second configuration is the same-wrist improvised setup. Mechanical watch on its bracelet or strap, Fitbit Air slid further down the same wrist on its own band, with both touching slightly. This works for a few days and then the two bands start to migrate against each other, the geometry never quite settles, and the Fitbit Air either pinches or slides loose. I have tried this for about two weeks. My wife at one point asked, in genuinely concerned tones, whether I was doing it on purpose or whether the tracker had simply slid down without me noticing. The honest answer was both. It is not a long-term arrangement.

The third configuration is what we built Smartlet for. Mechanical watch on top, Fitbit Air on the underside, a single strap threaded through the Smartlet adapter holding both in place. The geometry settles immediately because the adapter is engineered for this exact configuration. The Fitbit Air's sensor faces the underside of the wrist, which is where its readings are most accurate. The mechanical watch sits in its normal position, unmodified. This is the configuration I now wear most days, partly because it works, partly because I am the founder of the company that makes it, which I should disclose for the sake of intellectual honesty.

If you do not want to use Smartlet, the first configuration (two wrists) is the next-best option. If you want both devices on the same wrist without compromise, Smartlet is one of the few engineered answers designed specifically for this configuration. That may change as other companies develop their own dual-wear solutions. For now, it is the answer that exists.

Why this is not just a Whoop competitor

Much of the launch coverage has framed the Fitbit Air as a Whoop competitor. Tom's Guide's launch headline literally read "Forget the Whoop 5.0", which is the kind of framing the wearable press tends to reach for first. The comparison is reasonable in some respects. Both devices are screenless. Both sit on a strap that is the entire device. Both deliver insights through an app rather than a wrist display.

The framing also misses something important.

The Whoop's positioning has always been athletic, premium, and subscription-based. It targets serious athletes who want recovery metrics and are willing to pay between roughly $149 and $359 per year depending on the tier, according to TechCrunch's coverage of the Whoop 5.0 launch. The Fitbit Air, at $99 with a three-month included trial and no required subscription afterwards, opens the screenless wearable to a much broader audience. Casual fitness, sleep tracking, ambient health monitoring without the hardcore-athlete framing. The Whoop is a tool for athletes who want to optimise. The Fitbit Air is a tool for everyone else who just wants to know what their body is doing.

The size difference matters too. The Whoop 5.0 is, according to the manufacturer, only 7 percent smaller than the previous Whoop 4.0, and remains noticeably more substantial than the 12-gram Fitbit Air pebble. Tucking it under a watch was always physically possible but never quite elegant. The Fitbit Air's tiny pebble form factor is the first wearable to look like it was designed, accidentally or not, for the dual-wear use case.

This is probably not what Google intended. Google designed the Fitbit Air for ambient passive health tracking, not for combination with a mechanical watch. But the engineering choices they made, screenless, twelve grams, pebble-shaped, interchangeable strap, happen to produce a device that fits naturally into the dual-wear configuration the watch industry had not previously prioritised.

The Fitbit Air did not solve the dual-wear problem on purpose. It solved it by accident, which is often how the most consequential product decisions actually arrive.

Where the screenless wearable goes next, and why Apple matters

The Fitbit Air is almost certainly not the last screenless mainstream wearable. The category logic has been hardening into something very close to a consensus across the wearable industry over the past twelve months. Three signals, in particular, are worth taking seriously.

The first is Garmin. In January 2026, a Garmin "CIRQA" listing appeared briefly on several of the brand's own websites, described as a "Smart Band," with shipping timeframes pointing to a late spring or early summer launch in 2026. Garmin had been resisting the screenless category for years on the assumption that its core users wanted screens. The CIRQA listing, however brief, was the first concrete signal that the resistance had broken.

The second is Whoop. The same company that pioneered the screenless category several years ago reportedly doubled its revenue in 2025 and is now defending the category aggressively, including legal action that has already blocked one US competitor (Lexqi) from launching. A market that supports both Whoop's growth and litigation around it is a market that has matured into something larger than its early skeptics expected.

The third, and the one I find most consequential, is Apple. As UniLad Tech reported on 3 June 2026, rumours have been ramping up ahead of WWDC about an Apple screenless wearable, with a popular concept by Parker Ortolani and tech creator Emkwan dubbed "Apple Loop." The fan reaction to the concept is worth quoting because it captures the broader pattern: "This will help dust off the watch collection. Been considering the Fitbit but I hope this rumor is true." Another commenter wrote, simply, "Would def buy it. Don't want a screen on my wrist so this is great." The Apple-curious wearable audience is not asking for a smaller Apple Watch. It is asking for something that does what the Fitbit Air does, with Apple's ecosystem behind it.

Whether Apple ships such a device this year, next year, or later is genuinely uncertain. What is no longer uncertain is the direction of travel. The wearable category is broadening into two complementary product types: the screen-forward computer-on-the-wrist (Apple Watch, Pixel Watch, Galaxy Watch), which remains the dominant and fastest-growing wearable category overall, and the screenless ambient health tracker (Whoop, Fitbit Air, soon Garmin CIRQA, possibly Apple Loop), which serves a quieter but increasingly visible market. Both categories are growing. They serve different needs and often different moments in the same wearer's day. Many wearers will choose one. Many others will want one of each, alongside the mechanical watch that means something to them.

This is the configuration Smartlet was designed for from the start. Mechanical watch carrying meaning. Connected device carrying data. The mechanical watch on top, the connected device on the underside, a single strap holding both in clean geometric arrangement. The configuration is agnostic to which connected device sits in the underside slot. Fitbit Air today. Apple Loop tomorrow, if Apple ships one. Garmin CIRQA, Polar Loop, Whoop, or whatever screenless device matches your ecosystem preference. The Smartlet adapter does not particularly care. It cares about the geometry of the wrist, which is invariant across whatever the wearable industry decides to ship next.

What this means for mechanical watch owners is that the dual-wear case is moving from "edge enthusiast" to "mainstream possibility" faster than most people in the industry have noticed. Two years ago, wearing a wearable alongside a mechanical watch was something a few collectors did out of curiosity. One year ago, it was something a meaningful minority did with various improvised arrangements. By the end of 2026, it will be something a substantial share of mechanical watch owners do, because the wearables have become small enough, screenless enough, and cheap enough to make the dual-wear arrangement obvious rather than eccentric.

What the mechanical watch industry does in response remains to be seen. The conventional wisdom inside Geneva and the Vallée de Joux is that wearables are a threat to mechanical watches. The honest pattern, visible on actual wrists, is closer to coexistence. The mechanical watch carries meaning. The wearable carries data. The two answer different questions. The wrist, once you give it the engineering room, is large enough to hold both.

The Fitbit Air, in this story, is not the answer. It is the moment the question finally became visible enough that mainstream consumers could see it. The actual answer involves whatever physical infrastructure makes the dual-wear configuration clean rather than improvised. We built one version of that infrastructure. Others will build others. The most useful thing that happened on 7 May 2026 is that the question, finally, became impossible to keep avoiding.

FAQ

What is the Fitbit Air?

The Fitbit Air is a screenless fitness and health tracker launched by Google on 7 May 2026. It weighs 12 grams, measures roughly 36 by 18 by 8 millimetres, lasts up to seven days on a charge, and tracks heart rate, sleep, skin temperature, SpO2, heart rate variability, and automatic activity detection. There is no display. All data is consulted through Google's health app on a paired phone (currently transitioning from the Fitbit app to Google Health). The launch price is $99 including one fabric strap and a three-month trial of Google Health Premium.

Can I wear a Fitbit Air with my mechanical watch?

Yes, in three configurations of varying convenience. The simplest is to wear the mechanical watch on one wrist and the Fitbit Air on the other. The second is to wear both on the same wrist with separate bands, which works briefly but tends to migrate uncomfortably over time. The third, which is what I personally use, is a Smartlet adapter that holds both the mechanical watch and the Fitbit Air on the same wrist with a single shared strap. The adapter uses the watch's existing spring-bar interface between the lugs and does not modify the watch.

Is the Fitbit Air a competitor to the Whoop?

Partially. Both devices are screenless and rely on app-based data review. The Fitbit Air is smaller, cheaper at $99 versus the Whoop's annual subscriptions starting around $149, and aimed at a more general audience rather than serious athletes. The Whoop remains the more athletically focused product. The Fitbit Air opens screenless tracking to people who are not necessarily training for performance.

How does Smartlet work with the Fitbit Air?

The Smartlet adapter fits between the lugs of most compatible mechanical watch cases, using its own SS316L spring bars with a proprietary quickfit mechanism (compatibility depends on the lug width and inter-lug spacing). A single strap threads through the adapter, holding the mechanical watch on top and the Fitbit Air on the underside of the wrist. The Fitbit Air's sensor surface faces the wrist where its readings are most accurate. The mechanical watch sits in its normal position unmodified. The geometry was engineered for exactly this kind of dual-wear configuration.

Does wearing a Fitbit Air on the underside of the wrist affect its accuracy?

The underside of the wrist is a position where blood vessels sit relatively close to the skin, which is one of the conditions optical heart-rate sensors generally require to read well. A Smartlet configuration places the Fitbit Air against the skin with direct contact rather than through fabric, which should support accurate readings. Actual accuracy may vary by fit, skin tone, movement during exercise, and strap tension. We do not claim laboratory-grade superiority over the standard top-of-wrist position.

Will other screenless wearables follow the Fitbit Air?

Yes, with several already in late development. Garmin's "CIRQA" smart band appeared briefly on the brand's own websites in January 2026, suggesting a late-spring or early-summer 2026 launch. Apple has been the subject of accelerating rumours about a screenless wearable, popularly dubbed "Apple Loop" by tech concept creators, with reports intensifying ahead of WWDC 2026. Polar is also rumoured to be working on a new Loop generation. The category is no longer a single-product experiment. It is becoming a broad direction of travel across the wearable industry.

Will Smartlet work with Apple's rumoured screenless wearable?

The Smartlet adapter is agnostic to which connected device sits in the underside slot, because it was designed around the geometry of the wrist rather than around any specific manufacturer's product. If Apple ships a screenless wearable in a similar form factor to the Fitbit Air, it will fit the same configuration. The same applies to Garmin CIRQA, Polar Loop, Whoop, and any future screenless device with a comparable footprint. The configuration is what stays constant. The device sitting in it can change with the wearer's ecosystem preferences.