MOMENTUM X - Polarized Unisex SunglassesMomentum X frames are built from TR90 memory plastic, which retains its shape (and therefore its grip) even through large amounts of distortion or warping or stress. There is no moveable nose bridge, which increases stability and eliminates the chance of it breaking off at the wrong moment. Momentum X frames are so sturdy you can run over them with a car we know because weve tried! Polarized sunglasses with 100% UVA UVB Protection Triacetate lenses