Cressi Scuba Diving Snorkeling Freediving Mask Snorkel Set Frameless mask with single lens design, tempered glass lens for extra durability Ultra clear lens for vivid colors, soft and comfortable mask skirt, low volume design Push button buckle for easy strap adjustments, wide field of vision Dry top design snorkel, anti-splash top, special valve seals tube when submerged Corrugated smooth bore lower tube, quick release snorkel keeper, easy clear purge valve