•10+ hours of safe, natural heat•Warms up to 124°F / 51°C•Air-activated•Odorless•Ready-to-use•Long lasting•TSA approved•3 year shelf life Our unique chemistry compound makes our disposable warmer last longer than others.. Use it all day then dispose of it easily. Large Air-Activated Disposable Hand Warmer Don't Bundle Up, Bundle Off with our disposable hand warmer.