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It’s hard to have fun when your fingers feel like mini-popsicles and your gloves just aren’t doing enough. For those times when you need a little extra boost, these chemical hand warmers are here. The 3.5 by 5-inch pouches contain a mixture of iron filings, salt, activated charcoal, and vermiculite, which begins to produce warmth when it reacts with air, and keeps the heat on for up to eight ours. Stick them inside your gloves to warm up your hands, in the footbox of your sleeping bag to help keep your toes toasty, or in your camera case or your pocket with your phone to help preserve your battery life on the coldest days. (Alternatively, do like our digital editor did on an early-winter backpacking trip to Nebraska National Forest and stick them in your ventilated backpack with your Chihuahua when the temperature drops toward freezing.) Tip: Only need them for a little bit? You can stop the reaction by sticking the hand warmer in an airtight plastic bag. Buy a Pack of 10 Yaktrax Hand Warmers for $6 (40% off) now.