Environmentally friendly gel and natural dye inside
3 years guarantee
These can last from 30-90 minutes. How long these last, and the temperature they reach depends on the outside temperature, and how close to the body they are kept. Keeping these in an inside pocket will mean they last a lot longer than if they were left out in the open.
They generate up to 55 degrees of heat in seconds from clicking the metal disk inside. Simply click the metal disk inside and the pad instantly heats up.