This eyewear features proprietary 3M™ Pressure Diffusion Temple Technology, so there are no moving parts and nothing to adjust. As soon as you put on these lightweight glasses, you'll feel the difference as they automatically self-adjust to provide a secure, comfortable fit. The 400 Series offers the added features of a soft, adjustable nosepad and dual-injected padded temples. The polycarbonate lenses absorb of 99.9% UV rays. Options include a range of lens colors, frame colors, 3M™ Scotchgard™ Anti-fog Coating, anti-scratch coatings, and removable foam-lined gasket.