UNIQLO’s HEATTECH is an inner wear that features heat retaining properties to keep you warm and a soft texture to keep you comfortable all day. It has 11(!) main functions: heat absorption, heat retention, soft texture, stretchable comfort, shape retaining, anti-static, quick dry, moisture wicking, anti-odor, and odor control.

Its fibers absorb moisture that the body emits, and the fabric itself generates heat. Just wearing it automatically warms you—a surprising innovation in technology wear. Moreover, the layer of air in between the fibers does not allow the warmth generated to escape, so that you can continue to feel warm as long as you are wearing it.