Product category: Snorkeling mask For the crowd: children Size: XS Material: PC food grade liquid silicone Size selection: First measure the distance from the chin to the nose. If the length is 8.5cm-10cm (3.35 inch-3.94 inch), then this mask is suitable for you. note Children under 10 must be accompanied by an adult. Check whether the diving mask is broken before use. If it is damaged, it cannot be used again. 180 PANORAMIC FULL FACE DESIGN With our 180 seaview snorkel mask, your child can go diving to wonder at the beauty of the underwater world that your child'll see more amazing ocean creatures, like corals & sea turtles than ever before. 100% UV BLOCKING The SMACO Children's snorkeling mask features a UV coating. It gives you a clearer, brighter view and blocks all UVA and UVB rays to better protect your Children's eyes. ANTI-FOG DESIGN Our full face snorkel mask takes away the issue of fogging up on mask during diving. We maximize snorkeling experience through featuring a separate breathing chamber which creates an airflow away from your main viewing visor that helps to eliminate fogging on mask while your child can keep snorkeling for a longer period. SAFETY AND COMFORT This snorkeling mask has an adjustable headband. your child can easily adjust its size to fit your child head comfortably, allowing your child to move and breathe freely without losing the mask.