Count on the Carhartt Glacier Hat for a full day's warmth in winter weather. It's constructed of 90% polyester/6% wool/4% PU (polyurethane) blend soft thermal, which is a bonded fabric with fleece backing. *90% polyester/6% wool/4% PU (polyurethane) blend soft thermal *Bonded fabric with fleece backing *Embroidered 1889 twill patch sewn on front