Stay warm and cozy in style with Rothco's classic one-piece union suit. The thermal underwear features a classic ribbed knit, 8 button placket, and front vertical seat flap with 1 button.
Rothco Gen III Level I Silk Weight Underwear Tops are part of the ECWCS (Extended Cold Weather Clothing System) which provides extra warmth in cold climates.
Rothco's Polyester Extended Cold Weather Clothing System (ECWCS) features a 100% polyester with a soft and comfortable fleece lining. For added comfort, the underwear features a full cut. Be sure to view the matching tops as well.