The Difference Between FKM Rubber Straps and WIS Watch Straps Rubber Straps
Why WIS Rubber Straps Are Safer, Softer, Cleaner—and NOT FKM
When it comes to rubber watch straps, most retailers proudly advertise “FKM rubber” as their selling point. But here at WIS Watch Straps, we took a very different path—intentionally.
After more than three years of research, testing, and material refinement, we developed our own custom blend of silicone and rubber designed for one purpose:
to be safer, softer, more comfortable, and more durable on your skin than traditional FKM straps.
Because you don’t just wear a watch strap.
You live in it.
FKM Rubber: The Hidden Problem
Here’s what almost no one talks about:
FKM rubber is a synthetic fluorocarbon-based material. While strong and chemical-resistant, it’s not ideal for something you wear directly on your skin for 8–16 hours per day, especially during workouts, sleep, and daily activity.
FKM straps can contain:
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Harsh industrial chemicals
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Hormone-disrupting compounds
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Materials that irritate the skin over long wear
FKM is fantastic for machine parts and aerospace seals.
But for your body?
Not so much.
The WIS Solution: A Safer, Hypoallergenic Blend
WIS refused to follow the industry standard.
Instead, we invested years into formulating something better.
Our straps are made from a hypoallergenic, non-toxic blend of silicone and rubber—specifically engineered for daily, long-term skin contact.
✔ Hypoallergenic
Won’t irritate even sensitive skin.
✔ Non-toxic
No hormone disruptors. No harmful chemicals. No industrial compounds touching your body.
✔ Skin-safe for all-day wear
Whether you’re working out, sweating, swimming, or sleeping, our blend remains gentle on the skin.
We made it because it’s what we wanted to wear ourselves.
Softer. More Supple. More Comfortable.
Safer wasn’t enough—we wanted the straps to feel amazing.
So we created a proprietary spray-finish coating that keeps the material:
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Extremely soft
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Supple and flexible
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Comfortable against the skin
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Smooth for easy on/off
Customers constantly tell us WIS rubber straps feel “broken in” from day one.
This is intentional.
Why WIS Straps Stay Clean—Especially in White
FKM straps have another big drawback:
FKM absorbs dirt.
Light colors like white, yellow, or tan can start looking dirty—in some cases permanently—after only a few wears.
WIS straps? Entirely different.
Our silicone-blend rubber is non-porous, meaning:
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Dirt doesn’t cling
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Pen marks can be wiped off with a finger
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White stays white
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Bright colors stay bright
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The strap stays fresh-looking for far longer
Try drawing on an FKM strap.
Then try drawing on a WIS strap.
Only one of them wipes perfectly clean.
A clean white strap should stay clean—and ours does.
More Secure & Longer-Lasting
Because our material blend flexes naturally but doesn’t weaken easily, WIS straps maintain their shape and security longer than standard FKM options.
They’re:
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Tough
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Stretch-resistant
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Sweat-resistant
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Built to stay secure
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Engineered for real-world use
Collectors say it best: WIS rubber “just feels more trustworthy.”
Experience the Difference for Yourself
WIS Rubber Straps are:
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Safer
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Hypoallergenic
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More comfortable
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More durable
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Effortlessly easy to clean
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Made for real everyday wear
If you’ve only ever worn FKM straps, you haven’t experienced what rubber straps should feel like.
Discover the difference today at WIS Straps.
Your wrist will thank you.