Lightweight Thinsulate Hat RC133X – Warm, Comfortable & Winter-Ready This type of hat is built with advanced 3M™ Thinsulate insulation, which helps retain heat while remaining lightweight and breathable. It features a soft fleece lining, windproof construction, and a double-layer design to provide excellent warmth even in harsh conditions. https://borduurservicebelgie.be/product/rc133x-lightweight-thinsulate-hat/