This demonstration video discusses and shows the features of the Ocean Quest Arctic Clear HD Scuba Dive Mask. This mask is for all faces (60-240 lbs). One of a handful of masks that fits almost all faces. State of the Art Arctic Clear HD optical quality distortion free lens. Optional One-way purge valve- simply exhale through your nose and the water drains instantly. This is a low volume mask. Easily adjusted integrated, swivel buckles. Made of Crystal silicone - The highest grade silicone available for a soft comfortable seal.