1. Environmentally friendly silica gel. Nontoxic, tasteless, soft and comfortable. PC frame: no deformation, stronger and lighter. Antislip buckle: Professional antislip concaveconvex design, easy to adjust, nonslip and fallproof. 2. Safe lens made of tempered glass. The diving mask has a nose cover that is perfect for users who cannot stop breathing through their nose while swimming. Adjustment knob: Highprecision adjustment of the lens strap to prevent falling off. 3. Silicone strap: Good elasticity, durable, good workmanship, y and material. The swimming mask is made of soft, foodgrade liquid silicone, which is environmentally friendly and y. The easily adjustable mask buckles and flexible face edge are perfectly designed to fit virtually any face shape and head size. 4. Twoway waterproof valve: When the waterproof valve is in the water, it can automatically close after being submerged. Fully dry antiwave head: Automatic waterstop system, waterstop is r, breathing is calmer, when the wave hits, it can effectively prevent water from entering the airway.