The Pentax ZT500G Prescription Safety Glasses is a non-conductive frame designed to wrap around the face. Available in red and blue, these Pentax Prescription Safety Glasses feature a removable Skirt Seal foam gasket. These Pentax Prescription Safety Glasses also come with a head strap attached at the middle temple. In addition, these Pentax Safety Glasses are prescription available and meet the ANSI Z87.1 industry standards. Plus, the ZT500G Pentax Safety Glasses have passed the requirements of a modified ASTM D149-09 test for dielectric strength, and did not conduct electricity up to 1,000 volts for 60 seconds.