Surprisingly, even some people who spend hours at a time standing up don’t know about the wonders of insoles: padded shoe inserts that keep your lower extremities much, much more comfortable.

Some of them are insulated, too, and keep the frosty ground from making your toes numb. This, apparently, wasn’t enough luxury for someone, so they took the next logical step: placing a small electrical heater under your feet.

Thermrup Benefits

There are some non-electrical, disposable products that do the same thing, but we prefer this brand by a mile: it has four power settings, and the highest gets uncomfortably hot. Most people will use them at only one-quarter power.

They’re also suitable for all body types: simply cut along the outlines to reduce them from size 14 to as small as 4½ (approximately 47 to 36 in Euro measurements). They are about a fifth of an inch thick, which provides some padding without squeezing your feet.

The Downsides

Now for the bad part: though the heating element is made of flexible plastic and does a great job of warming your feet in sub-zero weather, there’s no room for the battery inside the sole itself.

Instead, you have to wear a strap around your ankle and run a cable down into the side of your shoe. Neither is all that uncomfortable (especially compared to borderline frostbite), but it does take some getting used to and probably isn’t the greatest fashion statement of the year.

The two batteries have to share a single charger, though at least they last about 10 hours on the lowest setting at full charge. They’re not waterproof, either, but getting your pants soaked when it’s snowy out isn’t advisable anyway.

Though slightly annoying, these aren’t terrible drawbacks.

Considering how durable they are, they’re great value for money, even if you’re the kind of person who prefers to tough out pain and discomfort.