Breathable and lightweight – the Nike Sport Loop is designed for fitness. The iconic Nike "Just Do It" logo is woven directly into the soft nylon using an innovative process. With the Velcro closure, you can easily and quickly adjust it. It features dense loops on the inside that serve as a soft cushion while allowing moisture to escape. The closure strips on the back are firmly integrated, providing 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.