The distortion-free, ultra-clear lens with high optical quality is comprised of tempered glass that has been toughened and can resist deep water pressure of 50m without breakage. It features a wide field of vision and clear light transmission also has a hydrodynamic styling with no exposed external frame. When swimming, snorkeling or diving, it can shield your eyes to the fullest extent possible, allowing you to better appreciate the underwater world of the beautiful seas in India. The skirt of the scuba diving mask is made of silicone, which is very soft & fits to the face, minimising pressure. This scuba diving product is appropriate for a variety of face shapes. The double-layer waterproof design of spearfishing mask with breathing valve is ideal for all swimmers, snorkelers and divers. The high elastic belt of this watersports equipment is connected by rapid adjustment buckles on both sides.