Our protective covers are made to fit all Apple Watch series according to size. The available sizes are 49mm, 45mm, 44mm, 42mm, 41mm, 40mm, 38mm and are compatible with all Apple Watch series 1, 2, 3, 4, 5, SE, 6, 7, 8 9, Ultra, Ultra 2. Don't know what size you need? Find your correct Apple Watch size.