A rubber watch strap you cut to length with scissors
Is this the right fit?
- Best for
- dive and sports watches, humid climates, and anyone whose silicone strap has already gone tacky
- Skip if
- FKM is noticeably stiffer than silicone at first and needs a couple weeks of wear to break in
- Check before ordering
- Confirm the dimensions, exact model, included parts and return terms on the Amazon listing before ordering.
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The ULLCHRO FKM rubber watch strap is made from fluororubber rather than the softer silicone used on most budget straps, which means it resists skin oils, sunscreen and UV instead of going sticky and collecting lint. It ships in 20mm and 22mm lug widths with spring bars already installed, so a swap needs no tools. The tail is designed to be trimmed with scissors to your exact wrist, which removes the usual problem of a strap that fits between two holes. FKM is stiffer than silicone out of the box and takes a week or two of wear to relax. Best fit: dive and sports watches, humid climates, and anyone whose silicone strap has already gone tacky.
Pros
- FKM fluororubber resists sunscreen, skin oil and UV instead of turning sticky like silicone
- Quick-release spring bars mean the swap takes under a minute with no tools
- Trim-to-fit tail solves the between-two-holes problem
- Available in both 20mm and 22mm, the two most common lug widths
Cons
- FKM is noticeably stiffer than silicone at first and needs a couple weeks of wear to break in
Frequently asked questions
How do I know if I need 20mm or 22mm?
Measure the gap between the lugs on your watch case in millimeters. That number is your lug width. Most mid-size sports watches are 20mm or 22mm.
Do I need a spring bar tool?
No. The strap ships with quick-release spring bars, so you slide the small lever with a fingernail to pop it in and out.
Is cutting it permanent?
Yes, trimming the tail cannot be undone. Wear it untrimmed for a day first to confirm the length you actually want before cutting.
What is the difference between FKM and silicone?
FKM fluororubber is denser and chemically resistant, so it does not attract lint or degrade from sunscreen and skin oils the way silicone does. It is stiffer initially in exchange.
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