Material: The strap is made from a durable double-weave nylon and cotton that is particularly soft and lightweight, comfortable to wear and gentle on the skin. Strap width (size): 22mm. This strap is compatible with all watches (including smartwatches) in the above strap widths. To determine the correct size, use a ruler to measure the inside distance between the lugs of the watch case. Adjustable: The strap has a durable hook-and-loop closure that can be operated (open and closed) thousands of times, allowing the watch to be attached or adjusted in seconds. Quick Release: Quick-release spring-loaded lever makes it easy to attach and detach the strap without tools. Just slide the quick release button with your finger. Washable: This one-piece wristband is washable when dirty, as the color is a permanent ink that won't fade . Ideal for sports and everyday use.