Smith Sport Optics Challis Sunglasses are perfect for those seeking a tighter fit and smaller lens profile. These sunglasses provide unparalleled optical clarity with ChromaPop and techlite glass lens technologies. Anti-reflective and hydroleophobic lens coatingsMedium-large fit / coverageHydrophilic megol nose and temple padsStainless steel spring hinges8 Base Lens CurvatureEvolve frame materialLifetime warranty.