1、Diving mask is made of tempered glass, safe to use, reduce the opportunity that lens crushed caused by the water pressure, reduce the harm to human body, safety and explosion-proof 2、​Use high-end fine silicone gel seal, soft and comfortable, reduce pressure, faying surface and water tight 3、Use adjustable buckle, humanized design, convenient to quickly adjust the size of head circumference 4、All dry breathing tube, which usually higher than the wave's height that avoid water pours into the tube 5、Liquid silicone mouth piece, use high quality material, soft, healthy and environmental protection, give you the most comfortable bite angle Description: Resistant tempered glass lens, provides better protection for the eyes. It provides better comfort, soft, silicone frame of the mask and snorkel mouthpiece. Strap with adjustable buckles for quick and easy adjustment. Ideal for swimming, diving, snorkeling or other underwater activities. Mask Features: 1. Diving mask is made of tempered glass, safe to use, reduce the opportunity that lens crushed caused by the water pressure, reduce the harm to human body, safety and explosion-proof. 2. Use high-end fine silicone gel seal, soft and comfortable, reduce pressure, faying surface and water tight. 3. Use adjustable buckle, humanized design, convenient to quickly adjust the size of head circumference. Breathing Tube Features: 1. Full dry breathing tube, which usually higher than the wave's height that avoid water pours into the tube. 2. Automatic pipe buckle(rotatable), convenient to connect with goggles, PVC material is durable and not easy to damage. 3. Adopt PVC tube, that air blocking will not occur even 360 degree fold. 4. Liquid silicone mouth piece, use high quality material, soft, healthy and environmental protection, give you the most comfortable bite angle. 5. Double orifice discharge valve, drain quickly and also can eliminate fine sand. Specifications: Glass Material: Tempered Glass Mouth Piece Material: Silicone Mask Material: PVC Head Band Material: PVC Color: Blue, Yellow, Black, Green (optional) Package Weight: approx. 410g Diving Mask Size: approx. 16.1 x 9.5cm / 6.3" x 3.7" Breathing Tube Length: approx. 44.5cm / 17.5" Quantity: 2pcs/set (1pc diving mask, 1pc breathing tube) Suitable: For Adult Package Included: 1 x set of snorkeling Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2.  Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please in kind prevail.