BYISYUE 20mm leather watch strap for Polar Ignite / Ignite 2 / Ignite 3 / Unite & Withings ScanWatch 2 42mm

What this BYISYUE leather strap is for

If you’re looking to swap the look (and feel) of your smartwatch for something a bit more classic, this 20mm leather watch strap from BYISYUE is aimed at wearers who want a leather-style band that still suits everyday movement. On paper, it focuses on comfort for regular use and on-the-go training, with a closure design meant to keep the watch secure.

It’s also the sort of replacement strap you buy when your current band feels too sporty or you simply want a different texture for work, travel, or weekend plans. It’s not an all-in-one solution for every wearable in the world, though—compatibility is specific, so it’s worth double-checking before you order.

Compatibility you should check first

This strap is described as compatible with 20mm bands for: - Polar ignite / ignite 2 / ignite 3 / Polar Unite / Polar Pacer (explicitly NOT for Polar Pacer Pro) - Withings ScanWatch 2 42mm / Withings ScanWatch 42mm - Withings Steel HR 40mm / Withings Steel HR Sport

It also states several exclusions. For example, it’s marked as NOT compatible with Withings ScanWatch 2 38mm / Withings ScanWatch 38mm / Withings Steel HR 36mm.

That “NOT for…” detail matters. If you have one of the excluded sizes/models, the strap could physically fit the width but still be the wrong match for how the attachment sits—so don’t assume “leather + 20mm” automatically means it will work.

Leather material and everyday feel

The strap is made from leather material described as durable, dust-proof, waterproof, soft and lightweight. The comfort angle is fairly clear: a softer, lighter leather style band tends to feel less bulky than thicker alternatives, especially during long wear.

It’s positioned as suitable for day-long training and regular everyday use, including outdoor activities. That’s the right mindset for this kind of replacement band: not just for occasional photos, but something you’ll actually wear.

One limitation to keep in mind: the description leans on “waterproof”, but it doesn’t define how water-resistant it is in practical terms (for example, shower level vs. swim level). If you regularly dunk your watch or expect heavy water exposure, you may want to be cautious and manage expectations.

Closure design and day-to-day security

This replacement strap replaces a soft silicone band style approach with what it calls a new clasp/closure design. The stated goal is a more secure locking mechanism, plus easier installation and removal using a one-button method.

In real-world terms, that’s the difference between a band that feels like it stays put and one that you’re subtly worrying about while moving. If you’ve ever had a strap loosen because the fit wasn’t quite right, this is the part to pay attention to.

Colours and styling

BYISYUE says the strap comes in many rich, muted colours, described as elegant and modern. That’s mainly a styling benefit—useful if you want to match different outfits or seasons, or if you prefer something less “techy” than a pure silicone look.

It won’t transform your smartwatch into a formal dress watch overnight, but a leather band can make it feel more intentional for office days and travel.

Who it suits (and who should skip it)

It makes sense if you: - want a 20mm leather-style replacement strap for a compatible Polar or Withings model listed above - care about a softer, lighter feel for regular daily wear - want an easy swap with a closure designed to lock more securely - like the idea of changing the look for training days, outdoor activities, and everyday office use

You may want to skip it if: - your device is one of the explicitly excluded models/sizes (like the Withings ScanWatch 2 38mm or Steel HR 36mm) - you need a strap for frequent heavy water exposure and want clearly defined water-resistance details - you’re buying without checking compatibility—because the “NOT for…” exclusions suggest this is not a universal fit

Is it worth it?

This BYISYUE leather watch strap looks like a solid “replacement for the real thing” purchase for people who already own a compatible Polar ignite series, Polar Unite/Pacer (excluding Pacer Pro), or certain Withings ScanWatch 2 / Steel HR sizes. The comfort and styling angle is the main pull, and the clasp design plus one-button install/removal is the sort of practical improvement that can make daily use less fiddly.

If you’re careful about the exact model and size list, it’s the type of strap that can be a comfortable upgrade from more basic bands. If you’re not sure which version you have—or you’re between sizes—then it might not be the best bet, because the stated exclusions are specific.

Quick FAQ

Will a 20mm strap work for any Polar or Withings watch?

Not necessarily. The listing provides a clear compatibility list and also states exclusions for certain Withings sizes, so it’s best to match your exact model.

Is the leather strap suitable for training?

It’s described as comfortable for training and regular everyday use, including outdoor activities. That said, “waterproof” isn’t explained in detail, so for heavy water use you may want to be cautious.

How easy is it to fit and remove?

The description says installation and extraction are easy and direct, using a one-button method.

Does it come in different colours?

Yes, it’s described as available in many rich, muted colours.

What is it not compatible with?

The listing explicitly excludes Polar Pacer Pro and certain Withings models/sizes (including ScanWatch 2 38mm / ScanWatch 38mm and Steel HR 36mm).