Madewith a special two-layer soft jersey knit, Pepper Bi-Plys long underwear is sure to keep you warm when you need it most. The unique double layer construction traps warm air between the two layers for excellent thermal retention. These womens thermal long johns are knit with MTF soft spun polyester fibers that transport moisture away from the skin to keep you warm, dry and comfortable. These midweight base layer pants are a tried-and-true favorite choice for comfort while protecting against the cold.