The sturdy keel of our Pro M Frame® was articulated with hinges and sloped for a tighter float across the brow. We reformulated its O Matter™, reengineering the flexible synthetic for even greater durability. It became the new M Frame®, a reinforced camber of POLARIC ELLIPSOID™ lens geometry that maintains visual clarity in a world of performance-sinking distortion. Three-point fit and full UV protection come standard. Choose from four interchangeable lens shapes, each available in a spectrum of hues that augment endurance with adaptability.