Mens Heat Holders Performance Base Layer Long Johns: When the bitter cold weather hits and wrapping up with hats, gloves and coats arent enough you need something better suited for the job of keeping you warm. These Mens Performance Layer Thermal Long Johns are ideal at keeping warm air close to the skin. With an easy fit design to go under your clothes for a smooth slim-fitting thermal base layer for the colder days where one layer isn't enough! WIth 3 different types of thickness: Warm, X-Warm & XX-W... - Manufacturers part number: Heat Holders_BUWHHLJMJetBlack_MP-5564