The Oakley X Squared sunglasses are all about style and performance. Using the latest technology and combining it with lightweight titanium alloy, these sunglasses give the best protection from the sun. These sunglasses are the only ones to have a 3D sculpted hypoallergenic frame and the strength to weight ratio makes this one of the lightest sunglasses around. Sturdy flex couplers on the frame make for a comfortable fit around the head. The Oakley X Squared Sunglasses feature UNOBTAINIUMA elements that increase the grip when you sweat as they increase the contact zones, helping the lenses stay aligned.