Discover bold performance with Costa's 6S9131 Mainsail XL sunglasses. Born on the water, these square-shaped frames offer a modern and structured look crafted from durable nylon and propionate in a warm brown tone. Featuring polarized grey lenses that reduce glare and enhance clarity, these Costa polarized sunglasses for men deliver premium sun protection with 100% UVA/UVB coverage. Designed for watermen who need functional innovation, Mainsail XL delivers advanced features like micro side shields for extra coverage, vented nose pads to minimize fogging, and retainer-ready temple tips for added security on active days. Stylish yet practical, these full-rim brown sunglasses embody the essence of coastal adventure. See What's Out There.