To ensure they last the longest, HotSnapz recommend boiling their products soon after they’ve finished and storing them in their clear liquid state. BUY NOW: HOTSNAPZ.COMFinally, we collated all that information to come up with a list of the 10 best hand warmers that we think offered something for everyone. About the author

If the inner ingredients get into the mouth or are swallowed seek immediate medical attention since the ingredients can be harmful if swallowed It’s not entirely waterproof but should heat up in just 10 seconds, and can be turned on and off as you please. Ideal for a day’s hike, there’s also a USB charging port, though it can’t be used at the same time as the heater. BUY NOW: LIFESYSTEMS.CO.UK The warmers are only for use in shoes or boots where air flow is restricted – do not use in sandals or other ventilated footwear as this may cause the warmer to overheat Hand warmers give pretty instant heat to your extremities, however, which can really help you feel instantly less chilly. They’re particularly good for those with poor circulation or conditions such as Raynaud's syndrome. What are the different types of hand warmer?

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With multiple colour options, a power bank option, and an ergonomically designed fit, this Human Creations rechargeable hand warmer is a great option for straightforward warming. It has two temperature options: low (41.6 °C) and high (47°C). Using the low setting, the hand warmer should run for up to 4 hours, whilst it’ll last up to 3 hours when used on the higher setting. It’s worth noting that once it’s on, the Zippo 12-hour burner can’t be turned off, though you can slightly control its run time by limiting how much fuel you add in. Catalytic hand warmers - Catalytic hand warmers require either charcoal or lighter fluid to generate heat. While they can offer significant heat retention, they can be a faff to activate and as such, many are being phased out and replaced with rechargeable battery-powered options. Be prepared for your camping trip to the great outdoors or festival with our guide on what to take. Doubling up as a power bank, the Lifesystems rechargeable hand warmer is one of the lightest electric options here. It has two internal heat plates for even heat distribution, four different temperature options, a useful battery indicator, and is ergonomically designed to fit in the palm of your hand.