• 55% Polyester, 20% Acrylic, 20% Nylon, 5% Wool
• Brushed Heatwave™ band lining

An awesomely warm beanie, the Format™ hat from Seirus® is not only stylish, it’s also bolstered by the heat-return technology of Heatwave™. The revolutionary dual heating system found in the Seirus® exclusive Heatwave™ lining reflects and amplifies your body’s heat to produce that warm cozy feeling we all look for in a winter hat. So you never have to sacrifice style for warmth.