Men's Striped 3M Thinsulate Insulated Thermal Beanie Hat by ProClimate These adults thermal winter beanie hats feature a fully polar fleeced lined with 40 grams 3M Thinsulate insulation which traps and holds body heat in for extra warmth and protection from the cold. The perfect accessory for lots of outdoor activities including camping, fishing, hiking, hunting, skiing, sports, walking and lots more.