DescriptionFunction and fashion collide in the Momentum X sunglasses. These frames are built from TR90 memory plastic, which retains its shape and grip through large amounts of distortion, warping, or stress. There's no moveable nose bridge to break off or ruin the fit. These frames are so sturdy, they've been strength-tested and approved by running over them in a car. Plus, with polarized lenses you'll give your eyes the protection they need from harmful UV rays.