Peak Vision XR4 Featuring our largest 1 piece shield type 6.25 spherical lens, the XR4 frame style is crafted from magnesiumaluminum alloy. XR4 features unobstructed vision with no vision obstruction from the fully adjustable nose bridge. The maximum wrap Dual ZoneZero Distortion lens delivers 100% UV400 eye protection. Width 136mm Depth 43mm Temple 120mm Fits medium to largebroad faces. Distortion In addition to the challenges associated with single filter lens, most sunglass lenses today are injection molded polycarbonate plastic , a 40 year old manufacturing technology. This technology, while producing light weight and inexpensive lenses, also produces lenses with very poor optical clarity. The distortion created during injection molding is a visible and pervasive artifact of all current performance sunglass lenses and also interferes with the ability to visualize contours and estimate distances. The graphic to the right shows a pair of our competitor's sunglasses bottom and PeakVision Sports Performance Eyewear through an optics viewer that displays optical distortion as a rainbow effect. To address the distortion in injection molded polycarbonate lenses, PeakVision Sports utilizes a new material called NXT This new material provides clarity equivalent to optical glass at less than 40% of the weight, while offering scratch and shatter resistance far superior to traditional polycarbonate lenses. Additionally, NXT offers 100% UV400 protection! Dual Zone PeakVision Sports incorporates two different technologies into a noticeably unique and differentiated lens by integrating multiple color management filters into a sport lens made from a revolutionary new optical polymer. PeakVision Sports developed the patented Dual Zone filtration that utilizes different filters in two zones of a sunglass lens. In the upper zone, neutral density gray filtration eliminates overhead glare from the sun and enhances distance perception. Through precise color and light management technology, PeakVision Sport's upper gray zone gradually transitions into an amber lower zone which enhances a golfer's ability to read the topography of the green. For skiers, the upper gray zone transitions into a vermillion lower zone. . Eye Strain Our patented Dual Zone lens addresses the number one challenge facing sunglass wearers 150 no single color filter can simultaneously address the extremes of light conditions always encountered