The metal frame of these slight-wrap sunglasses has adjustable nose pads, rubber end tips, and flexible spring hinges for a comfortable, secure fit while active. Polarized polycarbonate lenses reduce glare, enhance contrast, and block both UVA and UVB light. Matte Gunmetal frame has gray tint lenses; Matte Black frame has green tint lenses.California residents, read the Proposition 65 warning California Proposition 65 Warning California's Proposition 65 requires us to warn our customers if a product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm if exposure to those chemicals is above set limits. For this product, we provide the following warning: WARNING: This product can expose you to chemicals including Bisphenol-A (BPA) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov