Uniqlo Heattech, a set of 4 long-sleeved T-shirts and undershirts. ① Gray long-sleeved T-shirt is not cotton, so it's made of a warm material and is soft, perfect for the coming season. ② Navy: Heattech ③ Blue: Heattech Extra Warm ④ Black: Undershirt, not Heattech Worn for one season. For those who understand that these are used items, thank you.