This is a brand new, unused M-size set. ● Special minerals absorb and radiate far-infrared rays. ● The high-purity ceramics, incorporated into the fibers using unique technology, radiate far-infrared rays emitted from the body, promoting blood circulation and creating an environment that alleviates fatigue. ・ Fatigue reduction ・ Improved blood circulation ・ Relief of muscle stiffness and tension ・ Reduction of muscle fatigue ◎ Room Shirt - Short Sleeve Material: Body: 80% Polyester, 20% Cotton Collar Rib: 60% Polyester, 35% Cotton, 5% Polyurethane ◎ Room Pants Material: 80% Polyester, 20% Cotton