X-Loop comes up with original designs and gives classic shapes a twist, just like these men's aviator sunglasses that have their own unique look and feel. The frame is metal, and the arms are plastic -- a combination that allows the frame to bend, but stay rigid where needed. The arms are straight and thin with the X-Loop logo shown on the side in black and silver. The lenses are rounded, with a dark finish and set between a double-bridge structure that adds strength.