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.

Product Details: 

Jersey Knit Silk Weight Underwear Top
Moisture Wicking Properties Helps Keep You Dry
Anti-Odor Properties Prevent Bad Odors
Features A Long Back Tail And Thumb-Hole Sleeves