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. Design: Filtering reflective glare is essential for anyone on the water or outdoors. Costas absorb 100% of UV light, providing you the best in light management and protection C-Wall coating provides extra scratch-resistance and a barrier that repels water, oil and sweat for easy cleaning The lens' multipatented technology manages light by:Absorbing Harmful High-Energy Blue Light (HEV), Enhancing Reds, Greens, and Blues, Filtering Out Harsh Yellow Additional Details 6 Base Curve Decentered - Medium Coverage: Frames with medium-coverage and wrap that value style but still perform Narrow Fitting: A small lens front designed to fit those with a slightly narrow head 580P is Polarized Polycarbonate 580G is Polarized Glass