The hook and loop straps secure your mask firmly. A tough polymer construction prevents damage to your lower face. Small airholes provide proper ventillation. The unique shape of the mask leaves space for goggles. 2 foam pads keeps the mask comfortable and when worn. In the Box 1x Mask Specifications: Material PolymerWeight 0.19 lbs California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov