Crafted from high grade polycarbonate, machined from virgin materials and formed to shape. Align the angle of the lens to the proper position for your work application with ratcheting lens pitch adjustment. Lens/frame design allows air to flow freely up and away from lens to prevent fogging. Temples adjust to four different lengths. Adjustable nose pad conforms to a broad range of bridge sizes. Clip and tension mounted 9.5 base curved lens eliminates screws or rivets for quick and easy lens replacement. Provides 99% UV protection.