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These little beauties will keep your hands toasty for hours. Qc3.0 Fast Car Charger

When the weather outside is frightful, keeping warm is of utmost importance—but with heating costs through the roof these days, it's understandable if you're looking for more cost and energy-efficient ways to feel the warmth besides cranking up the thermostat every time you feel a bit frosty.

Enter rechargeable hand warmers, the versatile gadget you need whether you're gearing up for some outdoor adventures in the fall, winter, or spring months, or simply want to combat the chill of a drafty indoor space. Curious about how rechargeable hand warmers work, and whether or not they're both effective and safe? Allow us to break it down for you. Essentially, these lightweight handheld devices can be stashed anywhere you need some warmth, so you can keep them in your pockets along with your hands, or you can use them to heat up a water bottle, sleeping bag, or even your devices, like when you're camping or hiking. They can even be used on other body parts, such as your feet, as long as you check the specific product's safety guidelines and ensure it's safe to do so.

But they're even perfect for everyday use, especially if you're just relaxing on the couch and want to feel some soothing warmth during the coldest winter days and nights. Whether you're buying some as a gift for your loved one that's always freezing or this purchase is all for you, you'll seriously wonder how you survived winters past without having rechargeable hand warmers... er, on hand. Pun absolutely intended.

The unique design on these make them a great choice, allowing you to warm both hands at once with ease. With an oblong shape and a flat, magnetic back, each warmer emits heat from one side, so you can use them separately or attach them and use 'em together. This set includes three power levels and heats up to 131 degrees, charging by way of two USB ports and included connecting cables.

One battery charge will offer between four and eight hours of use, with a full charge taking around two hours.

Among the most durable options on the block, this pick includes an aircraft-grade aluminum inner frame, making it best suited for outdoor activities, such as skiing and hiking. It offers three heat settings, ranging from 97 to 131 degrees, making it a great option for milder days when you just need a little extra warmth.

It also comes in a slew of pretty hues and can be purchased in a two-pack in black. A double-sided heat source and 10000mAh battery ensures your hands will stay warm and cozy for up to 15 hours after three to four hours of charge time, and you can even use it to charge your phone on the go.

This compact cutie will fit comfortably in your hands, and it packs some serious punch thanks to its double-sided heating functionality. It will provide heat for up to four hours on one charge, so it doesn't have the longest battery life, but you'll be glad you have it on hand when you're out and about and need to warm up fast.

This sleek, electric dual-sided option makes a great stocking stuffer for anyone on your list, but we don't blame you if you buy one for yourself, too. Not only does it light up in multiple colors (offering added outdoor safety), the front display lets you know exactly how much battery life you've got left, so it will never die out on you unexpectedly. Heat settings range from 104°F to 140°F for those truly frigid conditions.

When used on the lowest setting, you'll score up to 18 hours of battery life in one charge, and it can also charge your phone, too.

Backpacking Solar Charger It's slightly "S" shape makes it surprisingly comfortable to hold in your hand, and it fits perfectly in your jacket or pants pocket, too. This warmer can be used either single-sided or double, offering up to 120 degrees of warmth thanks to six temperature settings. The battery lasts up to nine hours on the lower settings, and it's aces for charging up your devices when you're not using it as a hand warmer.