Hand warmer - Long lasting and safe natural odourless air activated heater - Up to 10 hours of heat - 40 pairsSafe, natural long lasting heat - Odourless, disposable, single use product, do not apply directly to skin. No need to shake or knead.Activation - Remove heater from outer packaging and shake to activate. Heater heats up in 15-30 minutes. If heat is reduced, expose heat to air and shake. After use, dispose of in the general waste. The ingredients are not harmful to the environment.Multifunctional heaters - Disposable pneumatic heating packs provide daily warmth and are ideal for when the temperature gets cold. They are available in a variety of styles, designed for your hands, feet and body.When to use them: for horse racing, outdoor sports activities, hunting and fishing, camping and hiking, yard work, jogging or walking with your pet. Convenient, compact and portable.