Safe Temered Glass Lens: Diving mask with a nose cover and a high-precision lens belt adjustment to help users keep the mask in place while swimming and manage breathing. Environmentally friendly materials: The mask uses non-toxic, tasteless silica gel that is soft and comfortable on the skin. The PC frame resists deformation, remaining strong and lightweight. The anti-slip buckle features a concave-convex design for easy adjustment and secure, anti-slip retention. Silicone strap and fit: The strap offers good elasticity and is made from soft, food-grade liquid silicone for a healthy, safe fit. The mask has easy-to-use adjustable buckles and a flexible face skirt designed to fit a wide range of face shapes and head sizes. Two-way waterproof valve and dry-top system: The valve closes automatically when submerged to prevent water entry. The full-dry anti-wave head provides an automatic water-stop system, making breathing smoother and reducing water intake when waves hit. Who this is for: Suitable for pool swimming, casual snorkeling, and open-water swims where secure fit and reliable water blocking are important. Use scenarios: - Pool training or family pool days, where a secure seal and easy adjustment matter. - Snorkeling in calm to moderate conditions, with reliable water blocking and comfortable wear for extended sessions. - Open-water swimming during beach trips, where waves and splash protection help maintain breathing comfort. Key benefits at a glance: - Secure fit with high-precision belt adjustment and nose-cover design - Safe, comfortable materials (silica gel, food-grade silicone) and durable PC frame - Easy, adjustable fit for most face shapes and head sizes - Reliable water-stop valve and dry-top system for smoother breathing in waves