HEATTECH with 100% cotton on the skin side. I bought this for a trip, but I no longer need it, so I'm selling it. It's unused, but it has been stored at home, so the bag may have wrinkles. It's a U-neck, three-quarter sleeve. - Brand: UNIQLO - Model name: HEATTECH EXTRA WARM - Color: Light Gray - Size: L - Material: 100% Cotton Thank you for looking.