Fire Resistant Environmental Ensemble
The Fire Resistant Environmental Ensemble (FREE) is a multi-layered, versatile insulating garment that is adaptable to varying mission requirements and environmental conditions. The system consists of undergarments, a base layer, midweight underlayer, light weather outer layer, intermediate weather outer layer, and an extreme/wet weather parka.
Source: Wikipedia — Fire Resistant Environmental Ensemble (CC BY-SA 4.0)