The inner lining is made from 100% cotton for comfort, with an extra layer of HEATTECH for warmth. HEATTECH has features such as heat retention, heat generation, moisture wicking, and antibacterial/odor prevention. Stretchy, soft fabric with excellent shape retention. A warm layer with brushed 100% cotton on the inner side. While maintaining the softness that is typical of HEATTECH, the fabric has a unique texture that gives it an unmatched flexibility suitable for casual wear. The low neckline and shorter sleeves stay hidden under outer layers.