These kumacross 20 sunglasses withstand an active lifestyle thanks to robust materials and high quality lenses the ultra light frames feature quick release temples that pop apart on impact rather than breakingfeaturesspx flex zoneswrap around viewwrap around protectiongrip systemsquick release hingeventilation systemhydrophobicvision advantage with lst lens concept this lens is extra light and withholds strong impact forcesdouble snap nose padsquick change lens system simple lens changin