Our new and improved filling process makes firing up these little pocket-sized furnaces easier than ever. They provide up to 12 hours of gentle, consistent heat. They're sleek - designed to fit in any pocket - and are refillable so you can use them on your outdoor adventures for years to come. Built for winter warriors, the Zippo Hand Warmer features a sleek and compact design, and fits easily into pockets, gloves and pants without the bulk of other warmers. The Hand Warmer uses Zippo Premium Lighter Fluid (sold separately) to produce more than ten times the heat as traditional models and lasts for up to 24 hours. The Hand Warmer also uses a Burner. The Zippo Hand Warmer comes with a one-year guarantee, making it a perfect fit for any outdoors enthusiast.