A sports strap for the Apple Watch is resistant to water and sweat. They're all made of plastic, which you can easily clean again after exercise. The silicone Nike straps from Apple have extra holes that provide ventilation during exercise. Nylon watch straps for the Apple Watch breathe more than silicone or rubber straps. Choose a strap with a Velcro closure if you want to put your Apple Watch on easily and quickly and adjust it to your wrist circumference. The pressure closure of silicone straps can take a little getting used to. The Apple Watch 38/40mm straps fit both sizes of Apple Watch. Do you have an Apple Watch 44mm? Choose a 42/44mm strap. It also fits on the Apple Watch 42mm.