Built for bold watermen who demand performance, the Costa Mainsail XL sunglasses deliver advanced functionality with a sleek aesthetic. The square frames, crafted from lightweight nylon and propionate, feature a sunglasses' universal fit that ensures comfort in every adventure. Micro side shields and integrated hooding minimize light leaks, while vented nose pads reduce the risk of fogging, keeping your vision clear no matter the conditions. Premium polarized lenses intercept glare, enhance contrast, and deliver 100% UVA/UVB protection for uncompromising clarity offshore. Finished with retainer-ready temple tips, these full-rim Costa sunglasses are designed for those who explore with purpose and passion. See what's out there with Costa.