Extremely compact, frameless low-volume silicone mask for very wide visual field. With a tempered glass lens & packed in deluxe storage box. We have used these masks a lot, both as primary and backup masks in connection with diving on deep wrecks in the sea or far into cave systems around the world. Also perfect as an emergency back up mask when combined with mask pouch. The Beaver Atomic mask has been our biggest selling mask for years!