Thank you for viewing. This is a Workman MEDIHEAL ROOM pants product. Size: L Color: Black Contents: Top and bottom set MEDIHEAL is fatigue-reducing wear that has been registered as general medical equipment. The high-purity ceramics, which are incorporated into the fibers using unique technology, radiate far-infrared rays emitted from the body. This promotes blood circulation through the far-infrared rays, creating an environment that alleviates fatigue. Thank you for your consideration. Color: Black系 (Black-based)