The ActionSleeve is a wrist strap for the Apple Watch. I use mine for the Apple Watch 2 42mm but there is a strap for the 38mm Apple Watch too! You can find both versions here. The ActionSleeve is great for the gym because cable curls and various other exercises often make contact with one’s wrist. This helps to better avoid the Apple Watch from becoming scratched, while working out in the gym and performing other activities. I’ve also worn the ActionSleeve on my ankle. That’s great because I can wear a standard wristwatch on my wrist, while tracking my fitness data with the Apple Watch 2 that is hidden underneath my pants!