LILΦbaby Lullaby Baby Moisture-Absorbing, Heat-Generating Microfleece Kids Sleeper Fits 110-130cm This kids' sleeper uses "Top Heat," a heat-generating material, at 50%. It uses "Top Heat," a new material made by processing polyester and rayon with special technology, which combines moisture absorption and heat generation, as well as moisture regulation. It quickly converts moisture from sweat into heat. It also excels in moisture regulation, maintaining a refreshing sleep environment without stuffiness or chills. The online description of the purchased item is as follows: "A warm and gentle sleeper made with moisture-absorbing, heat-generating material. This kids' sleeper is made of lightweight, soft, and highly insulating fleece material. It gently wraps around babies and kids who move around a lot in their sleep, allowing them to sleep soundly until morning. The fabric is woven with the moisture-absorbing, heat-generating fiber "Top Heat." "Top Heat" is a functional fiber with high moisture-absorbing and heat-generating effects, and it quickly absorbs moisture and sweat. It contains rayon fibers with a high moisture content, providing a gentle and comfortable feel against the skin. The fabric has also passed formaldehyde testing, so it can be used with peace of mind for young children." Material: Fabric: 98% polyester, 2% rayon (50% moisture-absorbing, heat-generating fiber Top Heat) Ribbing: 100% cotton Colors: Gray / Blue Shoulder width: 38cm Body width: 43cm Length: 60cm My child wore this over their pajamas while sleeping, so there are some pills on both sides, but I don't think there's any problem with the quality. It has thin snap buttons that can be easily undone, so it didn't bother them while sleeping, which was good. They also had a type with a zipper from the throat to the hem, but the child preferred this one, saying it was difficult to take off when they got hot while sleeping. Other than the pills, there are no noticeable scratches or stains. Please check the photos for the condition of the pills. Individual perceptions may vary, so please refrain from purchasing if you are concerned about various things. I would be happy if someone who understands that this is a used children's clothing item stored at home would purchase it. Please also read the profile section. #WearableBlanket #Children #Microfiber #Fleece #EnergySavingMeasures #Bedding #LullabyBaby