For those cold days, when it's hard to stay warm outside. Our thermo glove liners go on before your gloves. They use a special aluminted, stretch fabric developed for NASA to protect astronauts from the incredible cold of deep space. The fabric reflects body heat and thousands of tiny pockets trap it. They are very thin, so your hands stay comfortable and are easy to move when your gloves go on. But they add remarkable warmth. Machine washable.