Men's Ribbed Roll Up HatHeatWeaver plush lining Stretchable rib construction Advanced insulating yarn The Chunky Rib Heat Holders Hat with roll up cuff is exceptionally thermally effective, with a HeatWeaver plush insulating liner specially developed to hold heat in. The super soft lining feels great against the skin and it's also very efficient at using the heat that naturally rises from your head to keep you warmer for longer.