Features: *1. Submarine Mask: Anti fog, 180 field of view, fully dry waterproof system. Adjustable elastic band, does not pinch hair. *2. Single Tube Breathing: Single inlet and single outlet, with no interference between the inhalation and exhalation channels, effectively preventing fogging. *3. Built-in Floating Ball: After sinking into the sea, the floating ball is blocked by buoyancy to prevent seawater from entering. After floating out of the sea, the air inlet is opened by gravity to breathe fresh air. *4. Spiral Design: Dual channel design, increasing oxygen supply while ensuring no backflow of exhaust gas. Ergonomic fit design with 3D fit, tight and waterproof. Description: *1. Color: Black, Black Blue, White Blue, White Pink, White Green(optional) *2. Size: S/M: Adult small size suitable for women and children over 10yrs L/XL: Adult large size suitable for men *3. Net weight: 475g Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-2cm measuring deviation due to manual measurement. Package Includes: 1 X Snorkeling Mask ",