You don’t need heavy layers to be warm. This microfibre base layer is made with HeatFX: warmth technology for lightweight layering. HeatFX's innovative combination of fibers provides superior warmth and comfort without bulk. This long underwear has specially engineered pockets inside the fibers to create a thermal warming effect next to your skin. HeatFX base layer features: moisture management to keep you dry, spandex for stretch comfort, and heat retention.

Fabric content- 41% polyester/33% acrylic/23% Viloft viscose/3% spandex