New Comfortable Neoprene Strap Wrapper for Your Scuba Diving & Snorkeling Mask - 3 Dolphins This low-profile neoprene cover slips over your existing mask strap, making it easier to slide your mask on and reducing hair tangling. 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. Mask and silicone strap not included.