40mm Obsidian Mist Nike Sport Loop Features: Soft, breathable, and lightweight, the Sport Loop features a hook-and-loop fastener for quick and easy adjustment. The double-layer nylon weave has dense loops on the skin side that provide soft cushioning while allowing moisture to escape. On the reverse side, the attachment loops are securely anchored for superior durability. Specifications: Case Size: 40 mm One Size - Band fits 130- to 200-millimetre wrists Material: Woven nylon Compatibility with Apple Watch Models 38mm 40mm 41mm