Shop 6S9131 Mainsail XL in Los Angeles, CA

Sail through your day with the 6S9131 Mainsail XL black sunglasses by Costa, designed for watermen who demand boldness and performance. Featuring square frames crafted from durable nylon and propionate in sleek black, these full-rim Costa sunglasses for men deliver structured style with unrivaled functionality. Polarized pink lenses offer premium glare reduction, enhanced contrast, and advanced UVA/UVB protection, ensuring crisp clarity in any light conditions. Thoughtfully designed details like micro side shields and hooding minimize light leaks, while vented nose pads reduce fogging for uninterrupted wear. Whether on the water or chasing horizons, these polarized sunglasses embody the passion and versatility for those born on the water.