Polycarbonate & trivex are your lightest and most durable lens material options C-wall is a molecular bond which is Scratch-resistant 100% UV blockage for maximum protection 100% polarization kills reflected glare Costa Del Mar Sunglasses, style Tuna Alley is a Rx-able rectangular nylon sport wrap with polarized polycarbonate lenses. The Tuna Alley is designed with corrosion-resistant stainless steel hinges, adjustable wire core temples and special materials on the saddle nose bridge and temples to ensure comfort and minimize slippage. Vented temples reduce fogging. The Costa Del Mar logo is engraved on the temples. These Costa Del Mar Sunglasses have lightweight polarized polycarbonate lenses that provide amazing clarity and 100% UV protection.