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. The Velcro closure allows for easy and quick adjustments. It features dense loops on the inside that act as a soft cushion while allowing moisture to escape. The closure straps 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.