Made with a special two-layer soft jersey knit, these thermal base layer pants are sure to keep you warm when you need it most. The unique double layer construction of these men's long john pants traps warm air between the two layers for excellent thermal retention, while the special Chillys seasonings provide additional moisture management to wick away the damp, keeping you dry. Pepper Bi-Ply is a tried-and-true favorite choice for comfort while protecting against the cold.