Chase the horizon in the Costa 6S9131 Mainsail XL polarized sunglasses. Designed for watermen, these square, full-rim frames in sleek brown nylon and propionate deliver bold style and durability. Polarized grey lenses with classic base coloring provide advanced glare reduction, improved clarity, and 100% UVA/UVB protection for your sun-soaked adventures. Engineered with micro side shields, hooding, and vented nose pads for superior coverage and comfort. Retainer-ready temple tips add versatility, making these Costa sunglasses the perfect companion for life on the water.