Wear a smartwatch with your Formex Essence Leggera

Wear a smartwatch with your Formex Essence Leggera

Smartlet is compatible with the Formex Essence Leggera. Lug width: 18mm / 20mm / 22mm - natively supported with no adapter. Installation uses the standard spring-bar system. No modification to the watch required. Fully reversible in seconds.
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Forbes · CNET
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250+ clients
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35+ countries
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CES 2026 · Lépine 2025
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Patented
Formex Essence Leggera compatibility

Wear a smartwatch with your Formex Essence Leggera

In short Smartlet is compatible with the Formex Essence Leggera. Lug width: 18mm / 20mm / 22mm - natively supported with no adapter. Installation uses the standard spring-bar system. No modification to the watch required. Fully reversible in seconds.

Formex is the Swiss independent that builds watches the way it wants to build them. The Essence introduced a patented floating case system - four-point suspension that absorbs shocks and compensates for thermal expansion. The Leggera version brings that engineering into carbon composite, cutting case weight by more than half without losing water resistance or precision. A COSC-certified movement in a carbon case at this price point has no direct equivalent. The watch community noticed.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet One replaces your Formex Essence Leggera's strap via the standard spring-bar system and positions your smartwatch on the same wrist. Both watches run simultaneously, with no modification to the watch and full reversibility in seconds.
Model
Formex Essence Leggera
Lug width
18mm / 20mm / 22mm
References
166covered
Reversible
In seconds

Choose your edition

One mechanism. Three personalities.

Every Smartlet One includes the dedicated adapter for your wearable. Pick the finish that matches your style.

Smartlet One - Shadow - Smartlet

For the explorer

Smartlet One - Shadow

€399,00

4.9 (14)

Stealth. Switch in seconds, leave no trace.

  • Material SS316L steel, black PVD
  • Weight ~100g
  • Compatible with Rolex, Omega, Seiko + 100 more
Buy now
Compatibility

Formex Essence Leggera models supported

Covered references

166 references covered.

ReferenceMaterialDialLugSmartlet
0330.1.6620.100Stainless Steel 41mmBlue20mmCompatible
0330.1.6220.100Steel 41mmBlack20mmCompatible
0330.1.6020.100Steel 41mmWhite20mmCompatible
0330.1.C24.100Steel 41mmBlue/Silver20mmCompatible
0330.1.C24.200Steel 41mmGreen20mmCompatible
0330.1.C24.300Steel 41mmBrown20mmCompatible
0330.1.C24.400Steel 41mmYellow20mmCompatible
0330.1.6320.100Steel 41mmCopper20mmCompatible
0330.1.6420.100Steel 41mmGreen20mmCompatible
0330.1.C24.500Steel 41mmPurple20mmCompatible
0330.1.6120.100Steel 41mmGrey20mmCompatible
0330.1.6720.100Steel 41mmPurple20mmCompatible
0330.1.6820.100Steel 41mmTurquoise20mmCompatible
0330.1.6620.200Steel 41mmBlue Gradient20mmCompatible
0330.1.6920.100Steel 41mmSalmon20mmCompatible
FX-ES39-BL01Stainless Steel 41mmBlue20mmCompatible
FX-ES39-GR01Stainless Steel 41mmGrey20mmCompatible
FX-ES39-GD01Stainless Steel 41mmDégradé Grey20mmCompatible
FX-ES39-WH01Stainless Steel 41mmWhite20mmCompatible
FX-ES39-BK01Stainless Steel 41mmBlack20mmCompatible
FX-ES39-GN01Stainless Steel 41mmGreen20mmCompatible
ESS41-MET-BLU-2023Stainless Steel 41mmBlue Meteorite20mmCompatible
ESS41-MET-GRY-2023Stainless Steel 41mmGrey Meteorite20mmCompatible
ESS41-COPGRAD-2024Stainless Steel 41mmCopper Gradient20mmCompatible
ESS41-TEAL-2024Stainless Steel 41mmTeal Gradient20mmCompatible
ESS41-LILAC-2024Steel 41mmLilac20mmCompatible
FX-ES41-WH01Stainless Steel 41mmWhite20mmCompatible
FX-ES41-GM01Stainless Steel 41mmGamaret (Wine-Red)20mmCompatible
FX-ES41-AW01Stainless Steel 41mmArctic White20mmCompatible
FX-ES41-BL01Stainless Steel 41mmBlue20mmCompatible
0331.1.6220.900Black Dlc 43mmBlack22mmCompatible
0331.1.6220.100Steel 43mmBlack22mmCompatible
0331.1.6620.100Steel 43mmBlue22mmCompatible
0331.1.6020.100Steel 43mmWhite22mmCompatible
0331.1.6120.100Steel 43mmSilver22mmCompatible
0331.1.6320.200Steel 43mmBrown22mmCompatible
0331.1.6420.200Steel 43mmGreen22mmCompatible
0331.1.6120.200Steel 43mmGrey22mmCompatible
0331.1.6820.100Steel 43mmIce Blue22mmCompatible
0331.1.6920.100Steel 43mmTurquoise22mmCompatible
ES-41-BK01Steel 43mmBlack22mmCompatible
ES-41-BL01Steel 43mmBlue22mmCompatible
ESS43-BLK-2018Stainless Steel 43mmBlack22mmCompatible
ESS43-BLU-2018Stainless Steel 43mmBlue22mmCompatible
ES-39-BL01Stainless Steel 41mmBlue20mmCompatible
ES-39-BK01Steel 41mmBlack20mmCompatible
ES-39-SL01Steel 41mmSilver20mmCompatible
ES-41-GN01Steel 43mmGreen22mmCompatible
ES-41-GR01Steel 43mmGrey22mmCompatible
ES-41-SL01Steel 43mmSilver22mmCompatible
ESS43-SLV-2019Stainless Steel 43mmSilver22mmCompatible
ES-39-GN01Steel 41mmGreen20mmCompatible
ES-39-GR01Steel 41mmGrey20mmCompatible
ES-41-BR01Steel 43mmBrown22mmCompatible
ESS43-GRN-2020Stainless Steel 43mmGreen22mmCompatible
ES-39-BR01Steel 41mmBrown20mmCompatible
ES-41-BG01Steel 43mmBurgundy22mmCompatible
ES-41-IB01Steel 43mmIce Blue22mmCompatible
ESS41-BLK-2021Stainless Steel 41mmBlack20mmCompatible
ESS41-BLU-2021Stainless Steel 41mmBlue20mmCompatible
ESS41-WHT-2021Stainless Steel 41mmWhite20mmCompatible
ES-39-IB01Steel 41mmIce Blue20mmCompatible
ES-39-SM01Steel 41mmSalmon20mmCompatible
ES-41-PB01Steel 43mmPastel Blue22mmCompatible
ESS41-COP-2022Stainless Steel 41mmCopper20mmCompatible
ES-39-CB01Steel 41mmCobalt20mmCompatible
ES-41-PP01Steel 43mmPurple22mmCompatible
ESS41-PUR-2023Stainless Steel 41mmPurple20mmCompatible
ESS41-SAND-2023Stainless Steel 41mmSand20mmCompatible
ESS41-GMT-2023Stainless Steel 41mmBlack/Gmt20mmCompatible
ES-39-PP01Steel 41mmPurple20mmCompatible
ESS41-GLD-2024Gold Pvd 41mmChampagne20mmCompatible
ESS41-FRST-2024Stainless Steel 41mmForest Green20mmCompatible
ESS41-LIME-2024Stainless Steel 41mmLime Green20mmCompatible
ESS41-SKY-2024Stainless Steel 41mmSky Blue20mmCompatible
ESS41-DENIM-2025Steel 41mmDenim Blue20mmCompatible
ESS41-ROSE-2025Steel 41mmRose Gradient20mmCompatible
ESS41-LV-2025Steel 41mmLavender20mmCompatible
0332.1.6220.010Carbon Composite 43mmBlack22mmCompatible
0332.1.6620.010Carbon/Ceramic 43mmBlue22mmCompatible
EL-41-CB01Carbon Composite 43mmBlue22mmCompatible
EL-41-CB02Carbon Composite 43mmBlack22mmCompatible
LEG-41-CARB-BLK-2020Carbon/Composite 41mmBlack20mmCompatible
0332.1.6420.010Carbon 43mmGrey/Green22mmCompatible
EL-41-CB03Carbon 43mmGreen22mmCompatible
EL-41-CB04Carbon 43mmGrey22mmCompatible
LEG-41-CARB-BLU-2021Carbon/Composite 41mmBlue20mmCompatible
0332.1.6720.010Carbon 43mmYellow22mmCompatible
EL-41-CB05Carbon 43mmIce Blue22mmCompatible
EL-41-CB06Carbon 43mmBurgundy22mmCompatible
0332.2.6620.010Carbon 41mmBlue20mmCompatible
0332.2.6220.010Carbon Composite 41mmBlack20mmCompatible
RX-LEG-CHRONO-2022Carbon/Composite 41mmBlack/White20mmCompatible
LEG-41-ELBLU-2022Carbon/Composite 41mmElectric Blue20mmCompatible
EL-41-CB07Carbon 43mmCobalt22mmCompatible
EL-43-CR01Ceramic/Carbon 43mmBlack22mmCompatible
EL-43-CR02Ceramic/Carbon 43mmBlue22mmCompatible
0332.2.6420.010Carbon 41mmGreen20mmCompatible
LEG41-BRZBLK-2023Carbon/Bronze Insert 41mmBlack20mmCompatible
LEG-41-GRN-2023Carbon/Composite 41mmGreen20mmCompatible
LEG-41-FC-2023Forged Carbon 41mmGrey20mmCompatible
EL-41-CB08Carbon 43mmPurple22mmCompatible
EL-41-CB09Carbon 43mmSand22mmCompatible
EL-43-CR03Ceramic/Carbon 43mmGreen22mmCompatible
EL-43-CR04Ceramic/Carbon 43mmGrey22mmCompatible
0332.2.6320.010Carbon 41mmCopper20mmCompatible
0332.2.6720.010Carbon 41mmPurple20mmCompatible
LEG41-BRZBRN-2024Carbon Composite 41mmBrown20mmCompatible
LEG41-RED-2024Carbon Composite 41mmRed20mmCompatible
LEG41-YLW-2024Carbon Composite 41mmYellow20mmCompatible
LEG41-DSRT-2024Carbon Composite 41mmDesert Sand20mmCompatible
LEG41-DS-2024Carbon Composite 41mmDesert Sand20mmCompatible
LEG41-STBL-2024Carbon Composite 41mmStorm Blue20mmCompatible
LEG41-CRM-CARB-2024Carbon/Ceramic 41mmBlack Ceramic20mmCompatible
LEG-41-PUR-2024Carbon/Composite 41mmPurple20mmCompatible
LEG41-MINT-2024Carbon/Titanium 41mmMint Green20mmCompatible
LEG41-ORG-2024Carbon/Titanium 41mmOrange20mmCompatible
EL-41-CB10Carbon 43mmJade22mmCompatible
PEL-43-CR10Carbon/Gold 43mmGold22mmCompatible
EL-43-CR05Ceramic/Carbon 43mmCobalt22mmCompatible
EL-43-CR06Ceramic/Carbon 43mmPurple22mmCompatible
EL-43-CR07Ceramic/Carbon 43mmIce Blue22mmCompatible
EL-43-CR08Ceramic/Carbon 43mmBurgundy22mmCompatible
EL-43-CR09Ceramic/Carbon 43mmJade22mmCompatible
0332.2.6820.010Carbon 41mmIce Blue20mmCompatible
LEG41-ARC-2025Carbon Composite 41mmArctic White20mmCompatible
LEG41-FRST-2025Carbon Composite 41mmForest Green20mmCompatible
LEG41-PUR2-2025Carbon Composite 41mmPurple Ii20mmCompatible
LEG41-TURQ-2025Carbon Composite 41mmTurquoise20mmCompatible
FX-EL41-FC-BL01Carbon Composite 41mmBlue20mmCompatible
FX-EL41-FC-IB01Carbon Composite 41mmIce Blue20mmCompatible
FX-EL43-FC-BL01Carbon Composite 41mmBlue20mmCompatible
FX-EL41-FC-GN01Carbon Composite 41mmGreen20mmCompatible
FX-EL41-FC-SD01Carbon Composite 41mmSand20mmCompatible
FX-EL43-FC-GN01Carbon Composite 41mmGreen20mmCompatible
FX-EL41-FC-GR01Carbon Composite 41mmGrey20mmCompatible
FX-EL43-FC-BK01Carbon Composite 41mmBlack20mmCompatible
FX-EL43-FC-GR01Carbon Composite 41mmGrey20mmCompatible
FX-EL41-FC-BK01Carbon/Carbon Composite 41mmBlack20mmCompatible
FX-ES41-LTD-CP01Steel 41mmCopper20mmCompatible
FX-ES41-LTD-IC01Steel 41mmIce Blue20mmCompatible
FX-ES41-LTD-JD01Steel 41mmJade Green20mmCompatible
FX-ES41-LTD-RB01Steel 41mmRuby Red20mmCompatible
FX-ES41-LTD-SKS01Sapphire 41mmSkeleton20mmCompatible
FX-ES41-LTD-EM01Steel 41mmEmerald20mmCompatible
ESS39-BLK-2020Stainless Steel 41mmBlack20mmCompatible
ESS39-BLU-2020Stainless Steel 41mmBlue20mmCompatible
ESS39-SLV-2021Stainless Steel 41mmSilver20mmCompatible
ESS39-GRN-2022Stainless Steel 41mmGreen20mmCompatible
ESS39-COP-2023Stainless Steel 41mmCopper20mmCompatible
ESS39-PUR-2023Stainless Steel 41mmPurple20mmCompatible
ESS39-PET-2024Stainless Steel 41mmPetrol Blue20mmCompatible
ESS39-CHOC-2024Steel 41mmChocolate Brown20mmCompatible
ESS39-ICEBL-2024Steel 41mmIce Blue20mmCompatible
ESS39-JADE-2024Steel 41mmJade Green20mmCompatible
ESS39-YLW-2024Steel 41mmYellow20mmCompatible
ESS39-CORAL-2025Steel 41mmCoral Orange20mmCompatible
ESS39-EMR-2025Steel 41mmEmerald Green20mmCompatible
ESS39-RSUN-2025Steel 41mmRose Sunburst20mmCompatible
ESS39-WAVE-2025Steel 41mmSteel Wave Texture20mmCompatible
P-ESS-CARB-SK-2024Carbon 41mmGrey Skeleton20mmCompatible
P-FMX-EOILSteel 43mmOil Black22mmCompatible
P-FX-ES-SAP01Sapphire 41mmTransparent20mmCompatible
LADY-ESS-BLU-2024Steel 39mmBlue18mmCompatible
LADY-ESS-GRN-2024Steel 39mmGreen18mmCompatible
LADY-ESS-PEARL-2024Steel 39mmPearl White18mmCompatible

Formex Essence Leggera lug widths: 18mm / 20mm / 22mm

Formex is the Swiss independent that builds watches the way it wants to build them. The Essence introduced a patented floating case system - four-point suspension that absorbs shocks and compensates for thermal expansion. The Leggera version brings that engineering into carbon composite, cutting case weight by more than half without losing water resistance or precision. A COSC-certified movement in a carbon case at this price point has no direct equivalent. The watch community noticed.
Frequently paired

Smartwatches worn with Formex Essence Leggera

The most common combinations our customers wear. Find your mechanical watch and discover the right Smartlet edition.

Apple Watch
Series 0 to Ultra 3
Whoop
5.0 / MG
Garmin Forerunner
255 to 965
Samsung Galaxy Watch
Series 4 to 7
Withings ScanWatch
Light / 2 / Nova
View all brands
27 brands covered
Also compatible

Other brands

Other iconic models in the Smartlet compatibility library.

Submariner
Daytona
GMT-Master
Datejust
Yacht-Master
Sky-Dweller
Explorer
Seamaster 300 m
Speedmaster
Planet Ocean
Constellation
De Ville
Monaco
Carrera
Formula 1
Aquaracer
Portugieser
Navitimer
Superocean
Avenger
Black Bay
Pelagos
Ranger
Luminor
Radiomir
Submersible
SKX
Prospex
Presage
Khaki Field
BR 03-92
Cinquante brasses
Reverso
SUB 300
Spring Drive
Aquis
Plongeurs soixante-cinq
Chronographe 1
Capitaine Cook
L'héritage de Superman
El Primero
Tout afficher
Monarch
Black Bay 58 GMT
View all models
Watch brand compatibility guide

Step by step

Replace your strap
01

Replace your strap

Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.

Connect your wearable
02

Connect your wearable

Smartlet uses a dedicated adapter or native lug pins depending on your smartwatch. The connector snaps onto the Smartlet module. Zero modification to the mechanical watch.

Wear both simultaneously
03

Wear both simultaneously

Both watches sit on the same wrist. All smartwatch sensors maintain direct skin contact and operate normally.

Questions

Frequently asked questions

  • Does Smartlet work with the Formex Essence?
    Yes. The Essence and Essence Leggera use 20mm or 22mm lugs - both natively supported by Smartlet. No adapter required across the full range.
  • Does the Formex floating case system affect Smartlet installation?
    No. Smartlet attaches via the standard spring-bar slots at the lug ends, outside the floating case mechanism. The four-point suspension system is completely unaffected.
  • Which Formex Essence references are compatible?
    All Essence 39 at 20mm, Essence 41 at 20mm or 22mm, Essence 43 at 22mm, and all Leggera carbon variants. The Lady Essence at 18mm is also natively supported.
  • Where can I buy Smartlet for the Formex Essence?
    Smartlet is available at smartlet.io in Classic, Shadow, and Titanium. All finishes match the Essence's Swiss independent spirit and are compatible across 18mm to 22mm lug widths.
  • Does Smartlet damage or modify my mechanical watch?
    No. Smartlet replaces your standard watch strap using the existing spring-bar system. It makes no permanent modification to the watch case, lugs, or dial. The process is fully reversible in seconds. Your mechanical watch is unaffected and can be worn independently at any time by reinstalling its original strap. Smartlet is engineered to watchmaker tolerances and tested with the same care that goes into the watches it pairs with.