Toasti Toes are a life saver in terms of being comfortable and warm while you ski These little packs heat up when exposed to the air and then fit down inside your ski or snowboard boots where they continue to product heat for up to 8 hours Toasti Toes have a thin design and an adhesive backing so they fit seamlessly and comfortably into your boots One size fits all even kids so make sure you bring enough for the whole family Air activated for easy use Radiate 130-¦ to 140-¦ heat for up to 8 hours Thin design to fit comfortably into boots Adhesive backing keeps them in place without bunching Environmentally safe One time use disposable Do not use directly against skin