Lightweight, warm, high-performance 'PUFFTECH' padding, made with the latest fiber technology. Hollow fibers about 1/5 the thickness of a human hair trap air to keep you warm. *Comparison of polyester fiber padding material with human hair thickness of 0.08 mm. (Padding is 100% polyester), Removable fluffy yarn fleece collar., Ribbed inner cuffs keep cold air out., UNIQLO : CView the full collection