Set sail with the Costa 6S9131 Mainsail XL, the perfect companion for watermen who demand bold functionality and style. Crafted from durable nylon and propionate, the full-rim square frames in sleek black deliver a modern, structured look. These Costa sunglasses for men feature polarized silver mirrored lenses that not only cut glare but boost contrast, providing crystal-clear vision even in challenging light. Micro side shields and hooded design minimize light leak, while vented nose pads keep things fog-free. Retainer-ready temple tips bring added security, so you can explore with confidence. Designed for those who need water to breathe, these black sunglasses perform as hard as you do.