FYISWHO 20mm Silicone Watch Strap for Garmin Approach S50/S44/S42/S40/S12/J1 and Forerunner 570 42mm

What this strap is for

If you’re after a practical replacement band for a Garmin smartwatch, this FYISWHO silicone watch strap is built around a 20mm width. On paper, it’s aimed at Garmin models listed in the description, giving you a straightforward way to refresh the look or replace a worn sports band—without turning the job into a project.

The pitch here is pretty clear: silicone for everyday comfort, plus a quick way to swap the strap in and out. It’s the sort of accessory you’d buy when your current band gets grubby from regular wear, you want a different colour, or you simply prefer a softer feel for training days.

The essentials: comfort, water resistance and weight

The strap is made from “high quality” silicone, and the base description also mentions it’s waterproof, lightweight and durable. That combination is usually what you want in a watch band for exercise or day-to-day wear: something that doesn’t feel bulky, can handle sweat and light water exposure, and doesn’t turn into a chore to live with.

That said, not every silicone band wears the same—depends quite a bit on skin sensitivity and how often you wear it against damp conditions. So if you’re prone to irritation, it’s worth keeping an eye on comfort over the first couple of weeks.

Quick swap design (and what to expect)

One of the more useful parts of this strap is the connection method described: quick-release spring bars on both ends. The installation instructions in the base text explain that you push the pins into the watch mount and then lock the connector sides on both ends.

In real-life terms, that usually means you can change bands without tools or lengthy fiddling—handy if you rotate colours for the week, or if you want a “proper sports” strap for workouts.

There’s also mention of an aluminium buckle design for adjusting and securing the strap. On paper, that’s designed to make tightening and fastening simpler, and it’s meant to keep the strap in place.

Model compatibility: check the watch carefully

Compatibility is a big deal with straps, and this one is fairly specific. The description lists support for Garmin Approach S50, S44, S42, S40, J1, S12, and Garmin Forerunner 55, 158, 165, 165 Music, 245, 245 Music, 645, 645 Music, and Forerunner 570 42mm.

Do note the limitation explicitly stated: it is NOT for Garmin Forerunner 570 47mm. If your watch is the 47mm version, this is the kind of mismatch that can waste time and money.

It’s a good fit if you have one of the models above and you specifically want a 20mm silicone sports replacement.

Where it shines in everyday use

This strap is easy to recommend if your routine includes training, commuting, or anything that makes a watch band get knocked around. Silicone tends to cope well with sweat, gym sessions, and general outdoor wear.

A practical example: imagine you’re heading out for an evening run and you want a band that feels flexible and doesn’t clatter or stay damp for ages. With this kind of silicone sports strap, you’re not worrying about the “nice strap” being out of place—at least that’s the appeal.

It also makes sense if you’ve already got a Garmin device that’s compatible and you just want options. The base text mentions different colours available, which is often the simplest way to change the look without buying a whole new band system.

Is it the best choice? (limitations to consider)

It’s not perfect, but it is fairly targeted. You’re choosing a silicone strap—so if you prefer leather, metal, or a more premium “dress” feel, this won’t be that.

Also, while the description claims it’s durable and waterproof, it doesn’t give details on maximum water depth, abrasion resistance, or how it wears over long periods. If you’re the type who really tests bands with heavy, abrasive use, you may want to look for more specific long-term wear information before committing.

Mini FAQ

What width is this strap?

The strap is described as a 20mm bracelet replacement band.

Is it compatible with Garmin Forerunner 570 47mm?

No. The description specifically states it is NOT for Garmin Forerunner 570 47mm.

Is it easy to install?

The base description explains quick-release spring bars and a push-and-lock style installation, designed to be easy to install, adjust and secure.

Is it waterproof?

The description says it is waterproof, but it doesn’t specify the level of water resistance.

Final verdict

It makes sense if you want a 20mm silicone sports replacement for one of the listed Garmin models and you care about comfort, lightweight feel, and a quick swap setup.

It’s not for you if you’re using the Garmin Forerunner 570 47mm (this strap is excluded), or if you’re looking for a non-silicone style such as leather or a more formal finish.

If you prioritise an easy, everyday band replacement over anything fancy, this one is a solid “keep it simple” pick—just double-check the exact watch model and that 20mm match before you buy.