Enjoy all the views of the underwater world with this wide field of view, single lens scuba mask from tusa. The freedom elite uses several technological features tofort and function. Freedom technology enhancesfort, fit, and performance of your scuba mask by dimpling the mask skirt and varying the thickness of the silicone. Stability ridges paired with the low-friction mask skirt surfacefort on the fitting line. A 180° buckle system rotates to fully adjust to all head sizes. Tusa freedom elite scuba mask features: wide field of view single lens mask 180 degree rotational buckle system medium-large frame with internal mask volume five position strap angle adjuster round edge skirt 3d mask strap dimpled mask skirt surface with varied silicone thicknesses