The skull perfectly adapt to the natural shape of human's face fits to your face around your eyes to protect you from water or . Lens is PC very wear-resistant anti-glare and anti-UV; are with strong toughness super impact-resistant. The comfortable sponges are padded around the outer for rim of the frame which effectively eases the for facial pressure and ensures you a wearing. High shock absorption wear-resistance & slip-resistance. Arc-design provides you broad for and the holes on both sizes and mouth of the make the internal air circulate smoothly keeping you breathing fresh-air. Does not cause some allergies and other problems on human skin.