These are thin undershirts, not Heattech. They were worn by a total of three children. One child wore them a lot, but the other two only wore them a few times. All three shirts have a lot of pilling. The white one has stains on the sleeves. There was also ink staining. Please check the photos. We are looking forward to your purchase if you don't mind these issues. The tags have names written on them, and the printing has faded due to washing, making it difficult to read the material composition. They do not contain cotton. Children with sensitive skin may experience itching. [Black Crew Neck] Polyester 47% Rayon 38% Cupro (Bemberg) 10% Polyurethane 5% [White Turtleneck] Polyester 53% Rayon 42% Polyurethane 5% [Black Turtleneck] Polyester Approximately 52% Rayon 43% Polyurethane 5% *It may be incorrect because it is difficult to read. Also, the names will be covered, so the printing will also be unreadable. Please understand. Long-sleeved undershirt set of 3, available in black and white. - Colors: Black, White - Style: Long Sleeve - Design: Crew Neck - Quantity: Set of 3 Thank you for viewing.