Uniqlo Extra Warm Heattech Cotton Waffle Crew Neck Long Sleeve, 100cm. Purchased last winter and worn for one season. Unlike regular Heattech, this has a waffle knit fabric and doesn't look like underwear, so it's versatile. I used it both as an undershirt and as a long-sleeved T-shirt. Please understand that this is a used item, inspected by a layman, and stored at home.