There is discoloration at the same spot on the chest and back. 【Kaimin Labo】"Kaimin Labo Warm Super Cardboard Trainer Border Gray" Sleep quality is determined by body temperature! "Photoelectron" warms with body temperature. Recovery support wear recommended by sleep experts. Styling with comfort and texture that colors a rich adult lifestyle. "Recovery Support Wear" uses the high-performance material "Photoelectron" and, with the cooperation of Dr. Norinaga Shimizu, Honorary Professor at Osaka Prefecture University, who has been researching health and sleep for over 30 years, and Miho Mitsuhashi, a sleep therapist who has solved the sleep problems of over 10,000 people, this wear was developed. "Photoelectron" is a heat-retaining fiber that efficiently radiates far-infrared rays in the body temperature range. The source of warmth is the wearer's body temperature. You can get a warm and gentle warmth. I want to spend a stress-free relaxation time! It is not affected by the surrounding temperature, and it keeps the temperature inside the clothes constant. By incorporating the high-performance "Photoelectron" that warms with your own body temperature, we have created wear with excellent heat retention and body temperature maintenance. Kaimin Labo's "Super Cardboard Knit" has a 3-layer structure of 100% cotton fabric and Photoelectron fabric. There is an air layer between the fabric and the fabric, and it is structured to retain the air warmed by body temperature, Therefore, it has a unique elasticity and excellent heat retention. Because it warms in the body temperature range, you can spend comfortably without getting too hot or stuffy. ※ There are individual differences in the effects and sensations. ※ Photoelectron is a registered trademark of Farbest Co., Ltd. Sundai, Kawaijuku, Yozemi, Toshin