Heat Holders Men's Hudson Fine Rib Beanie - The new Heat Holders Men's Hudson Fine Rib thermal hats are created with our high performance thermal yarn and fur-like HeatWeaver insulation lining to maximize the amount of warm air held close to your body. Black outer: 100% Acrylic Charcoal outer: 55% Polyester, 45% acrylic All color linings: 100% Polyester One size fits most HeatWeaver plush lining Advance insulating yarn Style: HHM06050