Heat Holders Women's Thermal Cable knit Hat with Heatweaver Yarn Black Outer: 53% Polyester 47% Acrylic, Lining: 100% Polyester hand wash Ladies New Heat Weaver Hat, From The Heat Holders Range of Products. Advanced Insulating Yarn protects against the cold with superior moisture wicking abilities. Speciality Heat Weaver plush Fur Like Lining Maximises the amount of warm air held close to the skin. High Tog Rating of 3.4! The Higher the rating The Warmer you'll Be!! A super gift!