The basic layer (underwear) plays a vital role in the three-layer system. It keeps you warm during cold temperatures and moves moisture away from your skin during high temperatures. The technological material, which can consist of synthetic material or merino wool, has been designed in such a way that perspiration is wicked away when you exercise.
A few brand options :
A wide range of thermal underwear for men, women and children.
A full range of underwear and basic layers for men, women and children.
Craft’s thermal underwear is designed to be worn directly on the skin.