nylon UltraFit 2 bracelets are lightweight, soft and comfortable to wear. They are made from a double layer of elastic antimicrobial nylon, woven to allow moisture to escape. The bracelet wraps around the pins. It is secured by two Velcro fasteners at either end, making it easy to adjust, whatever the size of your wrist. These nylon UltraFit 2 bracelets are ultra reliable and durable.