The air holes on the strap can not only adjust the length, but also effectively dissipate heat, help air circulation, prevent sweating of the wrist during exercise, and allow your skin to breathe freely. It is especially suitable for wearing in humid and hot summer. This strap is waterproof, if the silicone strap accidentally gets wet, it is easy to dry and will not fade due to sweat and water, so you can enjoy your time in swimming, diving, cycling, camping, climbing and other sports.