The Protective Combat Uniform (PCU) is an interchangeable 15-piece, 7-level ensemble (the original block 0 configuration) that can be worn in layers appropriate for the mission.The PCU replaces the LEP.
The shirt and drawers are designed to provide light insulation for use in mild climates as well as a base layer for colder climates, worn next to skin by itself or in conjunction with other levels (level I) for added insulation and to aid in the transfer of moisture.Fabric is slightly different than level I in that it provides extra warmth but still wicks moisture away from the skin to allow for quicker evaporation.
In addition to being FR, this shirt has a mock neck design for added protection and also contains an antimicrobial property along with moisture management (wicking) capabilities.