Made of hard PC/liquid silicone/tempered glass, the snorkeling mask is safe, non-toxic and odorless Inside is soft silicone, which keeps you safe and won't give you headaches if you wear it for a long time The elastic headband fits easily and fits many head shapes. Release your hands for more freedom in the water The snorkel has a flexible water stop system that completely stops the water. The ball at the top of the tube automatically seals the air valve, preventing salt water from entering your mouth and increasing snorkeling time Tempered glass lens, clear underwater vision Fits the nose comfortably and is leak-proof The adjustable headband is securely attached to the head Silicone mouthpiece, comfortable to wear Quick release buckle Specification: Frame: PC Mask headband: food-grade silicone Lens: tempered glass Mask Size: 17*11*7cm Snorkeling Size: 45*3*11cm Pipe material: PVC Maintain: Wash the face mask with water after each use. Put the face mask in warm fresh water for a few minutes. Avoid corrosion after snorkeling at sea. Avoid using soaps or detergents to improve visibility. Keep dry after use. Do not place the face mask in direct sunlight. Do not wipe lenses with a towel, a glasses cleaning cloth for better. Do not let the face mask contact with hard surfaces. Notes: Please allow 1-2 cm (0.4-0.8 inches) difference due to manual measurement, thank you. The color of the item shown in the photo may vary slightly on your computer monitor because the monitor is not calibrated the same.