Explore the water with the Costa 6S9131 Mainsail XL sunglasses, crafted for bold performance and designed for watermen who live to chase horizons. These square frames, made from durable nylon & propionate, feature a modern multicolor front that stands out. These polarized Costa sunglasses for men come with mirrored grey lenses that reduce glare, enhance clarity, and offer 100% UVA/UVB protection even in intense light. Integrated side shields and hooding ensure minimal light leakage, while vented nose pads keep things fog-free, promising uncompromising comfort and coverage. With retainer-ready temple tips, these full-rim frames are built for those who need water to breathe.