The UltraFit nylon straps are lightweight, soft and comfortable to wear. They're made with an elastic dual-layer antimicrobial nylon weave that allows moisture to escape. The strap design loops around the pins and is secured via two sets of hook and loop fasteners at both ends of the strap, providing easier adjustability and a secure fit for a variety of wrist sizes (see your product specs tab for wrist circumference information). UltraFit nylon straps offer trusted performance and superior durability.