The wrap-style, half-frame design of these sunglasses includes an adjustable nose bridge and rubber bow tips for maximum comfort and minimum frame slip while active. Polarized polycarbonate lenses reduce glare, enhance contrast, and block both UVA and UVB light. Frame is lightweight, flexible, and durable Grilamid TR90 injection-molded plastic. Blue and Black frames have gray tint lenses; Matte Brown frame has brown 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