Features: This snorkeling mask with dry top system, allows you breathe as naturally as on land. Lining material adopts imported medical liquid silica gel, soft and fit your face. Advanced leak-proof silicone sealing mask with floating ball prevents water from entering in mask. The mask lens featuring anti-fog coating allowing you to see a more clear and colorful underwater world. With elastic head band, easy to put on or take off the snorkel mask. Specification: Color: Black/Pink/Blue/Green (Optional) Material: Silica gel S/M size: Inner diameter 17*13cm; Outer diameter 23*19cm L/XL size: Inner diameter 19*13CM; Outer diameter 23*19CM Note: Please allow 1-3cm (0.4-1.18in) difference due to manual measurement and slight color variation for different display setting. Package Included: 1*Snorkel Mask 1*Storing Bag 2*Earplug 1*Accessories set