Match your watch to your outfit with a casual Apple Watch strap. The watch straps are made of plastic, leather, and metal and all have a casual look. A plastic strap is resistant to water and sweat. That means you can keep it on when you exercise or shower. The longer you wear a leather strap, the more beautiful the leather becomes. With a metal strap, you look stylish and chic. When choosing a casual strap, make sure you choose the right size for your Apple Watch. A 38mm strap also fits a 40mm Apple Watch and vice versa. This also applies to the Apple Watch 44mm, as those straps also fit the Apple Watch 42mm and vice versa.