Warm stretchable rib-knit acrylic fabric. Versatile design - works with everything. Classic Carhartt Durability. A classic. You'll reach for it every time the wind gets blustery and the temperatures drop. Not only warm, but comfortable, too. Made of 100 percent acrylic rib-knit fabric, stretchable, one-size-fits-all, fits most any noggin, Carhartt label sewn on front.