Designed to give your Apple Watch an athletic, modern, and elegant look, suitable for intense workouts and everyday use. The Sport Band is lightweight and breathable, made from soft and flexible FKM rubber for all-day comfort. A low-profile pin-and-tuck mechanism ensures a secure closure. Highlights include 100% waterproof fluoroelastomer FKM rubber, internal ventilation channels, and a custom aluminum pin closure. Compatible with Apple Watch 41mm, 40mm, and 38mm (Series 1-9 and SE).