The Sport Loop is soft, breathable, and lightweight. With its Velcro closure, you can easily and quickly adjust it. The nylon fabric with two layers has dense mesh on the inside, providing a soft cushion while allowing moisture to escape. The closure strips on the back are firmly integrated for even more stable support. You can pair most bands with any Apple Watch Series 3 case or newer cases of the same size. 41 mm bands fit 38 mm and 40 mm cases. 45 mm bands fit 42 mm, 44 mm, and 49 mm cases.