Product Advantages

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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.

Product details

Mainsail XL is a direct size extension of one of our best-selling Hybrid Frames, Mainsail, providing a broader reach of water explorers the same functionality, versatility and aesthetic they’ve come to love. Micro side shields and hooding provide a heightened level of coverage, minimal light leak and protection from the elements. Vented nose pads increase ventilation across the frame, reducing the risk of fogging. Retainer ready temple tips allow users to affix any retainer of their choice to ensure their frames aren’t lost while exploring.

• Model name: Mainsail XL
• Item no: 6S9131 913108 59-18
• Frame color: Matte Tortoise
• Lens color: Gold Mirror
• Lens material: Polarized Glass (580G)
• Frame fit: Wide
• Size: XXL
• Lens curve: Base 6 Decentered

Wide Fitting

A large lens front designed to fit those with a wide head.

6 Base Curve Decentered - Medium Coverage
Frames with medium-coverage and wrap that value style but still perform

Lens details and technology

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

580® lightwave Polycarbonate

• C-Wall® Molecular Bond
  
• Mirror (Optional)
  
• Polycarbonate Lens
  
• Polarized Film
  
• Polycarbonate Lens
  
• C-Wall® Molecular Bond

Lightweight, Impact-Resistant

• Polycarbonate & the lightest, most durable lens material option
  
• C-WALL® is a molecular bond which is scratch-resistant