High-tech, lightweight body design. Exceptional chemical splash and 503act protection. Distortion-free optics. 4 base curve lens. 99.9% UVA & UVB protection to 385Nm. DSC# 73894 is uncoated and features SVQD2 side vent. DSC# 53510 is uncoated and features indirect venting as well as SV2 side vent. DSC #53513 features ENFOG an anti-fog coating, indirect venting, and SV2 side vent.