HEAT HOLDERS® thermal hats are created with our high performance thermal yarn and HEATWEAVER® insulation lining to maximise the amount of warm air held close to your body. The stylish outer layer is knitted with our super-soft Heat Holders thermal yarn, bringing you reliable insulation and protection from the elements. Our unique HeatWeaver® insulation is a plush fur-like thermal lining that traps warm air close to your head. This two-part construction creates a thermal cavity between the layers that holds in even more warmth, maximising thermal performance. The hat is approximately 10" (25cm) high and 9" (23cm) wide when laid flat and unstretched (not including the pom pom). Fibre Composition: Outer: 100% Acrylic. Lining: 100% Polyester. Machine Washable at 30°C. Can be tumble dried but are happiest when line dried.