The SF201AS is a SecureFit™ Protective Eyewear with clear anti-scratch polycarbonate lens and a moulded nose bridge. 3M pressure diffusion technology allows naturally adjusts the temples to individual head sizes for a customized fit to each person. This self-adjusting feature is possible through 3M's proprietary pressure diffusion temple technology, a new design with no moving parts and nothing to adjust. Designed to diffuse pressure over the ears, the glasses automatically adjust to the head and facial features of the wearer. Weighing less than 1 ounce, the durable, snug-fitting, flexible nature offers a more comfortable and personal fit than old-fashion "one-size-fits-all" glasses that are rigid and unyielding in design. This spectacle adapts to the wearer, rather than the other way around. The snug fit also keeps the glasses securely in place as the wearer looks up and down or side to side, eliminating the need for frequent repositioning of the glasses due to head movement.