UNIQLO HEATTECH Uniqlo U HEATTECH Cotton Turtleneck T-Shirt (Long Sleeve). The fabric is made of cotton material, and it's very warm up to the neck. This is a long-sleeved T-shirt from a special collection that pursues a high-quality wardrobe, led by Artistic Director Christophe Lemaire, along with a design team based in Paris's R&D center, where information on fashion and new materials from around the world is gathered. ● The outer layer uses 100% cotton, and the inner layer uses acrylic and rayon materials, providing the same moisture-absorbing and heat-generating effect as innerwear. ● It's HEATTECH, which keeps you warm. ● It's a regular-fit long-sleeve turtleneck that isn't too tight. ● Because the outer layer is cotton, it also matches casual styling. ● It's a versatile long-sleeved T-shirt that can be worn alone or layered. ● Because it has a very simple design, it's easy to match with anything. I'm selling it because I don't have many opportunities to wear it. The color looks different depending on the photo. Photos 1 and 9 show the actual color. Please refrain from purchasing if you are sensitive to items stored at home.