HearthHand™ Hand Warmer
- Heats up in three seconds
- Double-sided warmth fits in pockets
- All-day rechargeable battery life
- Doubles as a phone charger
Ships by
Mon, Oct 26
Tracked US Shipping
| Spec | Detail |
|---|---|
| Warm-up | Under 3 seconds |
| Heating | Dual-sided, 360° warmthaerospace aluminum heating elements |
| Heat settings | 3 levels104°F / 118°F / 131°F (about 40 / 48 / 55°C) |
| Battery life | Up to 8–10 hourson Low, from a single charge |
| Recharge time | About 3–4 hourswith the included USB-C fast-charging cable |
| Power bank | USB output portabout 1.5–2 emergency charges for most smartphones |
| Battery | Rechargeable lithium-ion, under 10,000 mAhcarry-on friendly |
| Shape & finish | Curved pebble shapesilky, non-slip matte finish |
| In the box | Handwarmer, USB-C cable, soft storage pouch |
How long will it last?
It depends on the heat level you choose:
- Low (104°F / 40°C): 8–10 hours, for everyday chill
- Medium (118°F / 48°C): 5–6 hours, for brisk winds
- High (131°F / 55°C): about 3–4 hours, for deep sub-zero cold
Rechargeable, not disposable. Chemical packets take a long time to warm up and die halfway through the day. This one heats in seconds, recharges over USB-C, and replaces packet after packet of single-use waste.
Cold hands, and a phone that dies in the cold. Two problems, one pocket.
Disposable packets are slow to warm up and fade before the day is done. Meanwhile, freezing temperatures drain your phone battery when you need it most. We built this handwarmer to fix both.
- Warm in under 3 seconds, on both sides. Fast-conducting aerospace aluminum spreads heat across both sides of the device almost instantly, so your palm and fingers are warmed at the same time the moment you switch it on.
- All-day heat, without the waste. A high-capacity rechargeable battery gives up to 8–10 hours of steady warmth on a single charge, across three adjustable heat levels.
- A backup charger for your phone. The USB output port charges your phone or earbuds on the go, for the times cold weather drains your battery while you're commuting, hiking or outdoors.
Small enough to go everywhere. The smooth pebble shape sits comfortably in your palm and drops into a coat pocket, purse or glove without weighing you down.
Built-in protection
- Smart temperature sensors — NTC sensors regulate the heat automatically and help prevent hot spots
- Automatic shut-off — if the sensor detects an abnormal temperature spike, power cuts out immediately
- Multi-point circuit protection — guards against short circuits, overcharging and overheating
- Soft storage pouch — included for sensitive skin or when using the highest setting
Will it get too hot to hold?
No. The built-in sensors keep the temperature steady and stop hot spots from forming. If you have sensitive skin, or you're using the High setting, slip it into the included soft pouch.
Is it safe in a coat pocket or bag?
Yes. Multi-point circuit protection guards against short circuits, overcharging and overheating, and the unit switches itself off if it detects an abnormal temperature spike.
Can I take it on a plane?
Yes. It uses a rechargeable lithium-ion battery under 10,000 mAh, which is within TSA and FAA limits for carry-on bags. Like all lithium power banks, it must go in your carry-on, not your checked luggage.
Get ready for the winter ahead with Hand Hearth
Instant pocket warmth that charges your phone too
All-Day Rechargeable Heat Without Disposable Waste
Replaces wasteful single-use chemical packets with a high-capacity rechargeable battery that delivers up to 8 to 10 hours of continuous, consistent warmth on a single charge across three adjustable heat levels.
Emergency Power Bank for Cold-Drained Phones
Built with a high-speed USB output port that charges your smartphone or earbuds on the go, protecting you when sub-zero temperatures threaten to kill your phone battery while commuting, hiking, or outdoors.
What customers actually say
Saved me on freezing Saturday morning soccer sidelines
"My daughter plays travel soccer, and sitting on metal bleachers at 8:00 AM in 25-degree wind was torture. Disposable chemical packets always took twenty minutes to get lukewarm and died halfway through the second half. I keep one of these in each coat pocket on medium. My hands stay completely toasty for both games, and I still had battery left to top off my phone in the car."
Brings color back to my Raynaud's fingers in two minutes
"If you have Raynaud's or poor circulation, you know the dread of your fingers going ghost-white and dead numb from just grabbing cold groceries. This thing heats up literally the second you press the button. Wrapping both hands around the smooth curved aluminum brings feeling and blood flow back faster than running warm tap water. It never leaves my coat pocket."
Kept my hands warm AND saved my phone on the ski slopes
"Used these for three days skiing at Breckenridge. Anyone who skis knows freezing chairlifts drain your iPhone battery from 80% to dead in ten minutes. I kept this in my chest pocket—it kept my phone warm so the battery didn't freeze out, and when my fingers started stinging on the lift, I slipped it into my mittens for instant relief."
Fits perfectly in your palm with zero rough edges
"The pebble shape is so comfortable to hold. It has a silky matte finish that doesn't slip, and it's small enough to drop right into a lightweight jacket pocket or purse without weighing you down. I use it on low for my 40-minute morning dog walks and only need to charge it about once a week."
Frequently Asked Questions
How long does the battery actually last on a full charge?
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On Low heat (104°F / everyday chill protection), it delivers 8 to 10 hours of continuous warmth. On Medium (118°F / brisk winds), it lasts 5 to 6 hours. On High (131°F / deep sub-zero conditions), it provides approximately 3 to 4 hours of intense warmth.
Does it heat up on both sides, and will it get too hot to hold?
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Yes, it features true 360-degree dual-sided heating so your palm and fingers are warmed simultaneously. It is engineered with intelligent NTC temperature sensors that prevent hot spots and automatically regulate the heat. For sensitive skin or when using the highest temperature setting, an included soft storage pouch is provided.
Can I take this on an airplane in my carry-on luggage?
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Yes. It uses a certified rechargeable lithium-ion battery under 10,000mAh, making it fully compliant with TSA and FAA regulations for carry-on baggage. (Like all lithium power banks, it must be kept in your carry-on bag, not checked luggage).
How long does it take to recharge, and can it charge my phone?
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It fully recharges in approximately 3 to 4 hours using the included USB-C fast-charging cable. The standard USB output port allows it to double as a backup power bank, providing roughly 1.5 to 2 full emergency charges for most standard smartphones.
Is it safe to leave inside a coat pocket or purse?
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Absolutely. The unit is built with multi-point circuit protection against short circuits, overcharging, and overheating. If the internal sensor detects any abnormal temperature spike, it automatically shuts down power immediately.