Cold hands on a walk? These little warmers are easy to slip into your pocket when you go out. When your hands get cold, simply tap the inner tablet and it will give off gentle but intense heat for about 20 minutes. Dip it in a pan of simmering water for 2 minutes, let it cool and you can use it again. Comes with a soft, washable microfiber cover. Dimensions of the heater 10 X 7 cm.