Slip on the Costa Del Mar Saltbreak Limited Edition Polarized Sunglasses when you're relaxing in a hammock on a tropical beach. Their polarized 400 glass lenses eliminate any annoying glares, block 100% of UV rays, and are 20% thinner and 22% lighter than standard glass lenses. They also resist scratching better than polycarbonate lenses. The heavy duty TR 90 nylon frame provides lightweight durability, and nose and temple pads enhance your comfort. Stainless steel hinges won't rust in case you decide to take a dip.