Strap Wrapper Neoprene Mask Strap Cover American flag Reduces hair tangling and makes it easier to slide your mask on and off. Neoprene cover slips over your existing mask strap. To install, simply slide one end of your silicone mask strap out of its buckle, slip it through the strap wrapper, and re-thread the end of the silicone mask strap back through its buckle.