RefrigiWear Thinsulate Insulated Convertible Glove Mittens with HotHands Hand Warmer Pocket MATERIAL: Polyester microfiber outershell with jersey knit liner; Additional, reinforced PVC palm patches help protect your hands and add durability when you need to handle items frequently STAY WARM: Extra warmth provided by 40 gram Thinsulate insulation with tricot lining plus integrated Jersey knit liner MAGNETIC TIE BACK: Enjoy both extra warmth and convenience when you want with these convertible mitts that go from mitt-to-glove with a magnetic tie back HAND WARMER POUCH: An integrated hand-warmer pouch on the back of the mitts allow you to easily insert hand-warmer packs, like Hot Hands, when you want extra warmth COMFORT RATING: Combat the cold with a comfort rating to 0F degrees. Ratings are based on outershell material, insulation thickness and material as well as glove construction.