Every frame of our Expedition Collection features co-molded HydroliteTM materials for specialized temples. Here's how it works: co-molded materials are injected together into a mold and fused into one material, creating a frame with specialized temples that perform in the harshest conditions on the planet. In other words, the more someone sweats, the better the sunglasses grip the skin. Costa Del Mar Bill Chaser Sunglasses Reg: $208.94 Costa Del Mar Blackfin Sunglasses Reg: $138.94 Costa Del Mar Brine Sunglasses Reg: $138.94 Costa Del Mar Corbina Sunglasses Reg: $148.94 Costa Del Mar Fathom Sunglasses Reg: $138.94 Costa Del Mar Fisch Sunglasses Reg: $148.94 Costa Del Mar Frigate Sunglasses Reg: $128.99 Costa Del Mar Gallo Sunglasses Reg: $158.94 Costa Del Mar Man-O-War Sunglasses Reg: $128.94 Costa Del Mar Permit Sunglasses Reg: $138.94 Costa Del Mar Pescador Sunglasses Reg: $138.94 Costa Del Mar Stringer Sunglasses Reg: $138.94 Costa Del Mar Wave Killer Sunglasses Reg: $128.94 Costa Del Mar Yellowtail Sunglasses Reg: $208.94 Costa Del Mar Zane Sunglasses Reg: $138.94