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The manufacturer emphatically recommends against doing this, so it's at my own--and a cat's--risk, but, on the colder days and nights, for the past four winters in Boston, I've stuffed 5-8 of the 18 hour "Super Warmers" into a wool sock, which I then put into the small house that we have in the neighborhood community garden for an outdoor cat. The warmer-stuffed-sock makes a kind of heating log. I wouldn't be surprised if I'm the product's best individual customer! But, a couple of people in the neighborhood contribute them, as well. When it's 32 F or below, before putting the "log" into the little house, I often stroke the cat's back and sides with it, which he likes. Especially when pressed together in the sock, the packets emit significant heat for 18-20 hours. Kind of amazing, but they actually do. As the "log" becomes hotter, the cat will leave contact with it, lying within an inch or so of it. For this cat, the Hot Hands have been lifesavers. He has never pulled the packets out of the sock, nor opened them, has shown no evidence ever of a burn, and he can push the "log" to where he wants it in the house. But, the manufacturer virtually has to say, don't do this.