Breathing system The snorkel mask uses a disposable outer air recirculation design that mechanically separates inhalation and exhalation. Inhalation occurs through the dual breathing tubes, while exhaled carbon dioxide and any remaining non-inhaled oxygen exit the mask to the outside. This arrangement supports a controlled breathing process while you are using the mask. Natural breathing while swimming You can breathe through either the nose or the mouth while in the water. Breathing is calm and steady, and an independent exhaust valve ensures that exhaust gases do not accumulate and that sufficient oxygen remains available. Silicone seal and waterproofing The silicone gasket provides a waterproof, comfortable seal that helps prevent water leaks. It features three waterproof mechanisms to help secure wear and enhance reliability during use. Family friendly design This snorkel set is suitable for the whole family. The mask has fully adjustable head straps and a high-quality silicone face seal that adapts to most face shapes, making it suitable for both women and men. Specifications and performance - Material: high-quality silicone on the face seal and shield for comfort and fit - Fully adjustable head straps for a secure, personalized fit - Three waterproofing mechanisms to reduce leaks - Double breathing tube for inhalation; dedicated exhaust system to vent CO2 and unused oxygen outside the mask Use scenarios - Family snorkeling trips at the beach or on vacation, suitable for adults and children - Pool or calm-water practice to learn breathing with a snorkel mask - Shallow-water snorkeling trips in lakes or reef areas where stable, breathable airflow is important This description preserves the original product’s function, materials, and intended use while presenting clear, customer-focused benefits and practical scenarios.