If you’ve stepped outside in New Jersey this week, you already know: it’s the kind of bitter cold that hits your fingers first — that sharp, why did I leave the house kind of cold.

Which is exactly why this 40% off deal on the Ocoopa Magnetic Rechargeable Hand Warmers is such a clutch, right-now buy.

The top-rated 2-pack is down to just $18 from $30, and more than 90,000 people grabbed them in the past month (me included — leading to the biggest hit of my family’s white elephant exchange!).

OCOOPA UT3 Lite Electric Hand Warmers

$30 NOW FOR $18 in Black

Currently on sale for 40% off and available with free overnight shipping for Prime members.

Buy now at Amazon

These things are basically a tiny, pocket-sized survival kit for the winter season.

They heat up in five seconds, which is exactly how long it takes for your hands to go numb when you’re scraping ice off your windshield or walking from the train to your office. And with three temperature settings that climb up to 126 degrees Fahrenheit, you can crank the warmth to match just how frozen you feel.

Even cooler is how they magnetically snap together. You can pull them apart and use one in each hand or keep them doubled up for that ultra-toasty, both-sides-warmed feeling. And when you’re done, they click back together and slip into a pocket, bag or even inside gloves since each one is under an inch thick and weighs only a couple of ounces.

They’re also UL-certified and have a built-in temperature control chip to prevent overheating — something your fingers and your peace of mind will appreciate. You can charge via the included USB‑C cable, and you don’t even have to worry about tossing them into your tote, because the port has a dust cover.

With your purchase, you’ll get the 2-pack of warmers, the charger, a soft storage pouch and an instruction guide.

For morning commuters, dog walkers, parents standing on icy sidelines at sports practice or, honestly, anyone just trying to blink and wake up in spring, you can’t go wrong with this under-$20 find.

The 40% off limited-time deal only extends to the Black colorway, but you can still get most of the other options on sale, too. You’ll just need to pay a little more!

• UNIHAND AI Hand Warmers Rechargeable 2-Pack for $20, instead of $30
• helloleiboo 43.7″ Extendable Ice Scraper for Car Windshield for $24, instead of $40
• RERPET Electric Ice Scraper for Cars for $35, instead of $40
• Nextmug – Temperature-Controlled, Self-Heating Coffee Mug for $100, instead of $130
• Comfier Hot Towel Warmer for $135, instead of $150
• NordicTrack T Series 5 Treadmill for $479, instead $599