Snorkel Set - Adult Scuba Diving & Anti-Fog Mask PROFESSIONAL GRADE MATERIAL: Only premium grade material is used in designing this snorkel set. Our mask is made with 4.0mm tempered glass to hold up under pressure and last for years. The mask creates a protective air tight seal to keep water out. COMPLETE SNORKELING DIVE MASK KIT: This scuba mask and snorkel recreation set is the perfect equipment to enjoy on your tropical vacation or in the pool. ADJUSTABLE SILICON STRAPS & SKIRTS: The skirts and straps of our diving mask and full dry snorkel package are made from high quality silicon that easily adjust to fit any head size. ANTI-FOG MASK: The diving mask has a lens with anti-fog tempered glass that will give you crystal-clear vision deep underwater. ELONGATED BREATHING SNORKEL - The 47cm long snorkel will allow you to stay well below the water's surface, while our soft silicone mouthpiece will remain comfortable every time you need a breath of fresh air. Integrated purge valve and splash guard to help keep water out of your mouth.