The Costa Mainsail sunglasses are a larger-fit extension of one of Costa's best-selling hybrid frames, designed to bring advanced performance, versatility, and signature style to more water explorers. Built for anglers, boaters, and outdoor enthusiasts who need a roomier fit, Mainsail delivers the same trusted functionality of the original Mainsail with expanded sizing and enhanced comfort.
Engineered for life on the water, Mainsail features micro side shields and integrated hooding that provide increased coverage, reduced light leak, and improved protection from sun, wind, and harsh marine conditions. This design helps enhance visual clarity and focus during fishing, boating, and all-day outdoor adventures.
For improved breathability and comfort, vented nose pads increase airflow across the frame to help reduce fogging in hot, humid, and high-activity environments. The lightweight construction ensures long-lasting wearability, making Mainsail ideal for extended days on the water.
Retainer-ready temple tips add extra security by allowing users to attach their preferred eyewear retainer, helping prevent loss during active use on boats, shorelines, or open water environments.
Paired with Costa's premium polarized lens technology, Mainsail sunglasses reduce glare, enhance contrast, and improve visibility in bright outdoor conditions. Durable, comfortable, and performance-driven, Costa Mainsail sunglasses are built for watermen who demand reliable protection and a secure, larger-fit solution for every adventure.
