Costa Del Mar Mainsail SunglassesFor the performance and style you need on and off the water, our Mainsail frames are your go to pair for every outing and adventure. Built with the same high quality materials and features you want everywhere from the beach to the big blue, Mainsail frames help keep excess light out with micro side shields and hooding, your frames in place with improved Hydrolite grips on the temples and help keep sweat and water out of your eyes with eyewire drains