SV-2 Twin Lens Mask, Red/Black Silicone SV-2 - TWIN LENS . Low volume for easy clearing and wider field of vision . Revolutionary push-button buckles allow easy, quick strap adjustment . Unique flexible buckle attachment swivels with facial movements and absorbs shock, preventing buckle breakage when mask is bumped . Clear or Black, double-flanged silicon skirt . Super lightweight, highest quality tempered glass lenses . Supplied in clear plastic box . Tool available for changing lenses, see Mask Accessories Below