Costa Blackfin Sunglasses are the epitome of Costa innovation, technology, and design. Costa Sunglasses are made with an emphasis on being water resistant, durable, and comfortable. Costa Blackfin Sunglasses are made with cold-injected nylon and Hydrolite frames, which grip more when exposed to sweat and water. Costa Del Mar Blackfin frames are hand-assembled. Integral stainless steel hinges provide durability and stability. TR-90 Nylon Frame is scratch, sweat, and shatter resistant. Polarized lenses provide relief from glare that comes from water and intense sunlight. Check out our Costa Lens Colors and Materials Guide above for more information on lens choices Comfortable, large fit is good for larger heads Certain lens colors are available with a Mirror Coating which absorbs glare and backlight Costa Blackfin Sunglasses are available in Alternate Fit which flatters those with higher cheek bones. Costa Blackfin Sunglasses are available in prescription lenses here. 100% UV protection For Men Costa Sunglasses come with Costa protective case and cleaning cloth.