HEAT HOLDERS Men's Thermal 3.4 tog Fairisle Jaquard Knitted Hat Navy Blue Outer: 97% Acrylic 3% Polyester, Lining: 100% Polyester Hand wash Mens Genuine Heat Holders 3.4 tog Thermal Hat Lined with soft plush Fur-like Lining Thermal warm and heat insulated lining - 3.4 tog for extra warmth Don't get caught out in the cold this winter! Matching gloves available along with all Heat Holder products in our Amazon store.