Unique Fitting Ring that has been built into the Mask Skirt. This technology enables the Mask Skirt to mold to all face shapes providing the ideal fit, seal and underwater experience; The perfect buckle and mask strap. The low profile buckle is slim and light weight. The easy adjustment buckle and strap is silent and effortless when making adjustments; Incredibly extra wide field of view; The silicone skirt molds directly to the lens. It's compact in size, lighter in weight, and incredibly comfortable.