Uvex Pivot Safety Glasses Part No. S21 Uvex Pivot Safety Glasses offer a unique patented Multi-Material Technology® (MMT) which provide soft cushioned frame comfort Uvex Pivot Safety Glasses Part No. S21 Uvex Pivot Safety Glasses offer a unique patented Multi-Material Technology® (MMT) which provide soft cushioned frame comfort while the wrap-around 8-base lens design offers exceptional eye protection coverage. Ratcheting temple angle adjustment and ventiliation channels minimize fogging and elastomer nasal pads minimize slippage. Meets ANSI Z87+ and CSA Z94.3 safety standards.while the wrap-around 8-base lens design offers exceptional eye protection coverage. Ratcheting temple angle adjustment and ventiliation channels minimize fogging and elastomer nasal pads minimize slippage. Meets ANSI Z87+ and CSA Z94.3 safety standards.