CRYSTAL SILICONE SKIRT - The double feather edged skirt of the mask is made of the highest grade crystal silicone to provide a snug, watertight fit while also delivering true comfort POLYCARBONATE FRAME - The frame of the mask is made of high density polycarbonate which provides strong resistance against impac QUICK-ADJUST STRAP BUCKLE - Non-slip double strap and quick-adjust spring-less strap buckles allow easy adjustments, even underwater 2-WINDOW DESIGN - This diving mask has 2-window design with wide field of front vision to provide you with an unbeatable combination of style and state-of-the art technology CLEAR VISION - Glasses are carefully crafted to provide optical clarity while low volume design ensures snug fit and easy clearing