Frame ballistic according to MIL SPEC MIL-PRF 31013 standard Material - O Matter® (impact and chemical resistant nylon) SI Ballistic M Frame® 3.0 Frame is an interchangeable ballistic frame suitable for eyewear from the same line. Such frames can be used by military personnel, law enforcement officers, hunters, etc. This Oakley® frame is certified to the ballistic standard MIL SPEC MIL-PRF 31013, which helps protect the eyes in case of impact from fragments or small high-speed objects. Compliance with the MIL SPEC MIL-PRF 31013 standard indicates that after hitting the glasses, the frame and lens have retained their integrity. These glasses also have high operational characteristics, fit snugly to the face, do not create visual distortions or obstacles. As a result, Oakley® glasses have a wide range of applications: operational tasks, training on the range or shooting range, as well as engaging in various sports activities.