Most traditional hand warmers contain a mix of chemicals (like iron, salt, and activated carbon) that react when exposed to oxygen, though there are plenty of battery-operated options available as well. Hand warmers work in a few different ways, depending on the specific product. Perhaps most commonly marketed toward winter-sports enthusiasts, these palm-size heat packs can also come in handy when you’re sitting in the stands of an outdoor football stadium, working an outdoor job (or an indoor job in a chilly environment, like a poorly insulated building), or just commuting to and from work during a polar vortex. Burns says even the bulkiest mittens won’t cut it, so she supplements them with hand warmers. “Once winter hits, I can’t get by with gloves my frozen fingers just turn blue,” says Stacey Burns, a reproductive-rights advocate in Minneapolis who has Raynaud’s. It’s even tougher if you have a condition like Raynaud’s, which further limits blood flow to fingers and toes. But why is it that even after you’ve bundled up in layers of thermals and sweaters under a heavy-duty coat, your hands are still freezing? That’s because your body prioritizes keeping your most important organs warm, sending more blood flow to your core and less to your extremities. ![]() On frigid winter days, keeping yourself warm can be something of an art form. Photo-Illustration: The Strategist Photos: Retailers
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