3M™ SecureFit™ Protective Eyewear is designed to diffuse pressure over the ears, so the glasses automatically adjust to the head and facial features of the wearer. Weighing less than 1 ounce, the durable, snug-fitting, flexible nature of SecureFit offers a more comfortable and personal fit than old-fashion "one-size-fits-all" glasses. The snug fit also keeps the glasses securely in place, eliminating the need for frequent repositioning of the glasses. Clear anti-fog coated polycarbonate lens absorbs 99.9% UV, while the 400 series features a +1.5, +2.0 or +2.5 reading diopter to help workers who have difficulty reading small print or who are engaged in small detail work.