Designed for multiple cold weather climates and activities the Generation III Extended Cold Weather Clothing System (GEN III ECWCS) consists of a versatile, multi-layered insulating system that allows the soldier to adapt to varying mission requirements and environmental conditions. Presented Level 1 lightweight underwear set consists of light undershirt and drawers and was designed for use in mild climates to provide light insulation when worn next to skin. However it can be use also in colder climates as a base layer or in conjunction with other levels for added insulation and to aid in the transfer of moisture. This quality thermal underwear is made from extremely soft and light special weave polyester that immediately takes moisture out and considerably increases the evaporation area. Moreover it is highly breathable, guaranteeing free circulation of air. The long sleeved shirt features a crew neck and the drawers go with an elastic waistband and standard front fly opening.