The Fisura Matchbox and Fire Hand Warmer (2 units) is the perfect set of portable thermal packs to keep your hands warm during cold weather. Made of sealed plastic with an internal solution of sodium acetate, water and PVP, weighing 70g per unit, these pocket gel packs quickly reach up to 57ºC when the small metal disc inside is pressed. Their reusable system is extremely simple to operate: just boil the packs in a pot of water for 5 minutes to dissolve the formed crystals and reuse them whenever necessary. With fun illustrations in the shape of a matchbox and flame, this double kit is great for sharing with friends on mountain trips, outdoor games or city outings.