Aqualung Scuba Snorkeling Silicone Mask Dry Snorkel Set Quality liquid injection silicone skirt | Unique swivel buckle system with push button release Split silicone mask strap is easily adjustable | Low volume two-tempered glass lenses 100% submersible dry top with Pivot Dry Technology | One-way purge valve Full flex section for correct positioning and comfort | Silicone Comfortable mouthpiece