The thermal underwear is lined with high-quality fleece and windproof, keeps you warm on cold autumn and winter days.The material composition is made of 90% polyester and 10% elastane, flatlock seams, this thermal clothing offers maximum freedom for your body and protects your muscle trauma during training and sports.wicking fabric is ideal for drying and drying sweat quickly. The thermal base layer is perfect against unpleasant odours caused by sweat and dirt. You can use any 5V/2A power package to power the thermal underwear so you can easily keep warm on the go.With multiple carbon fiber heating elements that quickly generate heat over the core areas of the body, you can easily adjust the temperature as you like with three-speed temperature control.