Apollo SV-2 MaskInstructors Choice The Apollo SV 2 mask is a proven quality dive or snorkel mask that generally suits most adult faces. Available in a range of colours and lens options Low volume for easy clearing and wider field of vision Revolutionary push button buckles allow easy, quick strap adjustment Clear or Black silicon skirt Super lightweight, highest quality tempered glass lenses Supplied in clear plastic box Prescription Lenses (full negative 1. 5 to 6