Thick fabric with a cotton look. A stylish T-shirt with HEATTECH functionality.The Uniqlo U collection is the realization of a dedicated and skilled team of international designers based at our Paris Research and Development Center led by Artistic Director Christophe Lemaire.Newly updated with compactly woven fabric. With bio-warming, insulating, anti-microbial, and moisture-wicking comfort features. Cotton on the outside and HEATTECH technology on the inside. Relaxed cut with dropped shoulders for easy layering. Inspired by vintage military underwear designs. Ribbed binding at the collar for added durability.