The Apple Nylon Sport Loop Nike watch strap is soft, breathable and light. This makes this strap ideal for sports. The strap is made of woven nylon threads. The nylon reflects when light shines on it. You can easily close the strap with the velcro fastener. This makes the strap easily adjustable. The inside of the strap contains a large number of small loops that not only form a soft layer, but also provide ventilation during exercise. This strap fits on Apple Watch 44 mm, suitable for a wrist of 145 - 220 mm. This is an original Apple accessory.