This is a UNIQLO U collaboration T-shirt, said to be the best-selling item in the world at Uniqlo. The outer fabric is made of high-quality natural cotton, and the lining is Airism, so it feels good against the skin and I think it can be worn comfortably even at this time of year. The five-sleeve length and oversized fit are fashionable and make it a great piece. I wore it once after purchase and have washed it. Please consider it.