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 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 The 40mm band works with the 38mm case; the 44mm band works with the 42mm case.