Zenon Z11sm™ Rimless Safety Glasses provide excellent protection from dust and debris while simultaneously providing all-day wearing comfort, especially for those with smaller, more slender faces. With the same lightweight, rimless design as classic Zenon Z12™ eyewear, Zenon Z11sm™ glasses have been modified with a reduced frame that's ideal for men and women who have narrower faces. Their thin, flexible temples provide a secure fit without uncomfortable pressure points. 10 BCR (Base Curve Radius) polycarbonate lens provides 99.9% UVA/UVB protection.