This is the SeaSoft SEA-DIAL Adjustable Mask Strap to Ensure Perfect Fit, Angle and Tension of your Mask Features: Allows you to tighten your mask strap in 1/4 increments Available with black mask strap or clear This is the future in mask straps. From Bruce Justinen, President of SEASOFT SCUBA, "If you use the SEADIAL(TM) just once, you will dive with one the rest of your life. It allows the mask to pull perfectly straight on your face giving you a perfect fit. It allows for perfect tension and fit and most of all comfort." The SEADIAL(TM) has a dial at the back that allows you, even with thick gloves to tighten or loosen your mask in A 1/4" increments unlike a normal mask strap where you are trying to fing those small ends and then you pull the strap too tight or not tight enough. With the SEA DIAL(TM) - always have the perfect fit. Seriously, you have to try this mask strap. It is worth every penny. "