Costa Mainsail XL sunglasses deliver the same trusted performance as the bestselling Mainsail in a roomier fit. Micro side shields and hooding block light and shield your eyes from wind and spray, while vented nose pads minimize fogging during active water sessions. The retainer-ready temple tips let you attach your preferred retainer for peace of mind on the water. Matte black frame pairs with blue mirror 580g polarized lenses for clarity and glare reduction in bright conditions.
- Model name: Mainsail XL
- Item no: 6S9131 913103 59-18
- Frame color: Matte Black
- Lens color: Blue Mirror
- Lens material: Polarized Glass (580G)
- Frame fit: Narrow
- Size: XXL
- Lens curve: Base 6 Decentered
Blue Mirror Lenses
Best for bright, full-sun situations on the open water and offshore.
- Gray Base
- 10% light transmission
Costa Facts:
- Premium Polarized 580 Lenses*
Filtering reflective glare is essential for anyone on the water or outdoors. We sell only polarized sunglasses. - 100% UV Protection
Your Costas absorb 100% of UV light, providing you the best in light management and protection. -
Scratch Resistant and Durable
The C-Wall coating provides extra scratch-resistance and a barrier that repels water, oil and sweat for easy cleaning.
Lens Details:
Costa 580® lenses
Costa 580® lenses were designed by in-house light spectrum experts to enhance colors because standard sunglass lenses fell short.
The lens' multipatented technology
manages light by:- Absorbing Harmful High-Energy Blue Light (HEV)
- Enhancing Reds, Greens, and Blues
- Filtering Out Harsh Yellow
Superior clarity & Scratch-resistance
- Glass Provides The Best Clarity In Material
- Encapsulated Mirrors (Between Layers Of Glass) Are Scratch-Proof
- 20% Thinner And 22% Lighter Than Average Polarized Glass
The pictures and product description of these sunglasses belong to Costa del Mar; We are The Room surf and Skate Shop, an authorized Costa retailer, based in Puerto Rico since 2001.