BCB Hand Warmers - Reusable & Portable Hand Warmers for Winter, Pack of 2 (White) - Perfect for Outdoor Activities, Skiing, Hunting & Cold Weather Commutes

Product Description Opening the sealed packaging lets oxygen react with the bag. Within a minute they release constant heat. Typically these packs are used for comfort, increasingly however, they are used in rescue operations where a survivor is trapped in a cold or exposed place. Set Contains: 2 x hand warmers

Working temp 57C to 70C

Duration of max heat 7 hours

Within a minute they release constant heat.