Mens Thinsulate 3M Thermal Fingerless Gloves Black OUTER LAYER - These THMO gloves have two layers built into them to facilitate the process of keeping your hands warm. The outer layer is knitted made with 100% acrylic and is there to protect your hands from cold elements like snow, ice and hale. INNER LINING - The inner lining is made with 3M 40g Thinsulate lining. The purpose of the lining is to hold warm air inside the gloves and to keep the hot air close to your skin.