Part of the USMC FROG (Flame Resistant Organizational Gear) Program, this mid-weight underwear layer is made by various government contractors for the military.
The undershirt is a 1/2 zip design with a mock turtleneck, a lower front internal kangaroo pocket and long sleeves with a monkey paw design.
The mid-weight FR grid fleece underwear is a flame resistant version of the polyester grid fleece underwear. It will provide improved moisture management, insulation and comfort when worn in intermediate to cold weather environments. In addition, it provides Marines with FR protection when needed. The FR Grid Fleece can be worn as part of the Mountain Cold Weather Clothing System or Flame Resistant Organizational Gear (FROG). This replaces Desert Tan versions.