The Fisura "Break in Case of Cold" hand warmer is the ideal reusable pocket-sized thermal pack for providing immediate relief from cold hands during colder weather. Measuring 10 x 6.5 cm and weighing only 70 grams, this thermal device is made of sodium acetate, water, and PVP, and its temperature rises to 57°C the instant the metal disc is snapped. The regeneration process is very practical; simply place the pack in boiling water for 5 minutes until the crystals dissolve completely. Featuring the slogan "Break in case of cold," it's the perfect accessory to always carry in your coat pocket or backpack for walks in the park, daily commutes, or winter sports.