Explore life on the water with the Costa 6S9131 Mainsail XL sunglasses. Born on the water, these square-shaped, full-rim frames are crafted from durable nylon and propionate for a sleek and sturdy design that performs beautifully in coastal environments. With polarized silver mirrored lenses, enhanced contrast, and advanced glare protection, these Costa sunglasses for men offer unmatched clarity even in intense light. Micro side shields and hooding minimize light leaks while vented nose pads ensure a fog-free view. Retainer-ready temple tips offer added versatility for water-bound adventures. Bold, functional, and designed to protect, these polarized sunglasses are a lifestyle essential for watermen who demand performance and style.