FYISWHO 20mm silicone watch strap for Polar & Withings (quick-release, sport replacement band)

What it is and why you might want one

This FYISWHO silicone watch strap is a sport-style replacement band made for specific 20mm watches. The idea is pretty straightforward: if your existing strap has seen better days, or you want a more everyday, sweat-friendly option, a silicone band can be an easy swap—especially for training days, washing off grime, and general day-to-day wear.

On paper, it targets compatibility with multiple models from Polar and Withings, plus it uses quick-release spring bars for fitting. That’s handy because it means you’re not fighting with tiny tools every time you want to change the look or mood of your watch.

One quick limitation to keep in mind: it’s not listed as compatible with a few specific variants (for example, Polar Pacer Pro and certain smaller Withings sizes). If you’re buying for the right watch size and model, it should be a much smoother experience.

The essentials (compatibility & material)

Compatibility is the big thing here. The strap is described as compatible with 20mm bands for:

Polar ignite / ignite 2 / ignite 3 / Polar Unite / Polar Pacer (not for Polar Pacer Pro). Withings ScanWatch 2 42mm / Withings ScanWatch 42mm / Withings Steel HR 40mm / Withings Steel HR Sport (not for Withings ScanWatch 2 38mm, not for Withings ScanWatch 38mm, not for Withings Steel HR 36mm).

So if your watch is one of the excluded versions, this won’t be the right buy. It’s not a “universal” strap in the broad sense—more of a targeted replacement.

Material-wise, it’s silicone. The manufacturer positions it as comfortable, waterproof, lightweight and durable. That combination is exactly what you tend to look for in a strap that gets used rather than stored away.

What you’ll notice in daily use

The silicone construction is where you’ll feel the benefit. It’s the kind of band that tends to sit comfortably on the wrist during workouts, commutes, and hot days. Since it’s described as waterproof, it also fits naturally into situations where you might get caught out by rain, sweat, or the usual splashy moments of life.

There’s also a practical comfort angle: silicone can be easier to keep looking decent than more delicate strap types, assuming you give it a reasonable rinse and dry when it needs it.

As a micro example, imagine heading out for a gym session: you clip the band on with the quick-release style ends, wear it for the full workout, then after you’re done you rinse off sweat and leave it to air-dry. For many people, that “use first, worry less” routine is exactly why they switch to silicone.

Installation and security

Installation is designed around quick-release spring bars at both ends. The description says these push the pins into the watch lugs and lock both sides on the connector. In other words, the fitting approach is made to be fast and secure.

It also mentions an aluminium buckle design, which is supposed to make adjusting and keeping the strap in place straightforward.

That said, don’t assume every strap swap will be identical for every wrist and every watch lug. If your existing strap is already difficult to remove, or the spring bars on your watch are particularly tight, you may need a calm, careful approach rather than forcing it.

Where it stands out (and where it can fall short)

What stands out is the focus on sport use: silicone, described as waterproof, plus a quick-release style fitting. It’s the sort of replacement band that fits well if you want fewer worries about day-to-day wear.

However, it’s not without caveats. The compatibility list includes specific inclusions and exclusions, so if you’re not 100% sure your model matches what’s listed, you could end up with a strap that simply doesn’t fit. Also, because it’s a sport replacement band rather than a premium dress strap, it may not suit people who want a more formal look.

It’s a “make the watch feel right for the day” type of purchase, not a full-on upgrade to a different class of strap.

Who it suits (and who should be careful)

It makes sense if you: want a silicone band for training, errands, or general everyday wear, prefer a lighter, water-friendly feel over materials that get fussy, need a replacement and your watch model is on the compatible list, plan to change straps occasionally thanks to the quick-release approach.

You may want to skip it if: your watch is one of the explicitly excluded models/sizes, you’re looking for a strap that’s meant to look dressy rather than sport-focused, you’re trying to fit it to a watch size or variant that isn’t clearly covered.

Should you buy it? (final verdict)

This FYISWHO silicone watch strap is worth considering if you’ve got one of the compatible Polar or Withings models listed and you want a practical sport replacement: silicone for comfort and waterproof use, plus quick-release fitting for easier swaps. It’s the sort of band that earns its place because you’ll actually wear it—especially when sweat, rain, or everyday scuffs are part of your routine.

But it may not be the best choice if you’re even slightly unsure about the exact watch variant. Because the listing calls out multiple “not for” exclusions, compatibility is the main risk here. Double-check your watch model and size before you commit, and you’ll avoid the frustrating scenario of buying a strap that can’t be used.

Mini FAQ

Is this strap truly compatible with all Polar and Withings watches?

No. The listing is specific: it includes certain Polar ignite/Unite/Pacer models and specific Withings ScanWatch/Steel HR sizes, and it explicitly excludes others.

Does it use a quick-release fitting?

Yes. The description states there are spring-release connectors at both ends that push into the watch lugs and lock in place.

Is the silicone strap waterproof?

It’s described as waterproof, which is the main reason people choose silicone for everyday and sport use.

Does it have an adjustable buckle?

Yes. The description mentions an aluminium buckle design and that the size can be adjusted using the buckle.

What if I’m not happy with the strap?

The listing claims friendly customer service, offering a replacement or a full refund if you’re not satisfied.