The Oakley OO9521-0357 Tourniquet sunglasses combine a matte black frame with Prizm Black lenses, delivering a stylish and functional design. The lightweight O Matter frame ensures durability and comfort, while the Prizm Lens Technology enhances color and contrast for a superior visual experience. The square frame shape provides a sleek look, and the Unobtainium earsocks and nose pads increase grip with perspiration, ensuring a secure fit during high-intensity activities. These sunglasses offer 100% UV protection, making them perfect for both sports and everyday wear. Oakley Tourniquet Matte Black w/Prizm Black OO9521-0357