Oakley flak 20 xl iridium sunglassesthe xl edition offers a standard size frame with enhanced lens coverage and every millimeter of the peripheral view is optimized with high definition optics in a durable yet lightweight design that takes performance to the next level and brings style along for the ride essential gear for competition flak 20 xl has 875 base lens curvature for protection against sun wind and impact and patented xyz optics maintains clarity along the full curve while yo