We use only Li-Polymer batteries.
That means:

• Our batteries are safer than our competitors.
• Thermo Soles® batteries are leakage-proof.
• Ultrathin / ultralight compared to regular Lithium-Ion batteries
• Pollution-free for your environment.

USER REVIEWS

Adam Howard
Editor, Backcountry Magazine
Got cold feet? Perhaps, like I have, a history of frostbitten piggies from long days in the mountains? For about a hundred bucks, you can get a pair of Thermo soles, the first battery-powered, heated foot bed that weighs about the same as a cork orthotic. Unlike Hotronics, which feature heat elements attached to a rather bulky, boot-mounted battery, Thermo Soles charge like your cell phone: Plug the foot beds in for a few hours, and when you’re ready to ski, unplug; turn them on via a tiny switch in the back; slip them into your boot liner and go. There is no heat adjustment, but I found the heat was pretty even, and worked well for at least four hours. (The manufacturer claims the batteries can last up to eight hours.) They’re supple enough to work well in a telemark boot, but don’t provide near the support of your classic, cork, custom footbed. To wit, you can’t crank them up to broil, like you might with Hotronics. Given my history with frostbite, I’ll probably use Thermo Soles on multi-hour tours when it’s 10° F or colder. Warmer than that? I’ll stick to my cork foot beds for support, comfort, and control.

Matthew M Donovan
"...I tried them with a bit of reservation because I had used something similar and they got soggy and sort of wet after a few hours of use. :( Well, I haven't been disappointed yet with these Thermo Soles.I am active guy so I use these about 40-50 hours a week in the winter. If I charge them at night they are ready for me in the morning. They don't get my socks soggy and they actually keep my shoes smelling better. (Don't know how that works?!!) I recommend these to my sons and I think I'll get them each a pair for Christmas if they still haven't bought them."

P.A. Irene
"I am one U.S. Forest Ranger based in southern Montana who loves the Thermo Sole shoe inserts. I use them almost every day Nov-Feb! They stay warm for my longest hikes up at mountain-top stations. They fit nice and snug in my boots and are easily worth every penny."

Brian P.
"Only once did my Dad have to tell me about these before I wanted to try them for myself. My feet have always gotten cold in the snow or just when it's really cold out. They were a little expensive, but a good deal when I actually saw how much I used them. Great product!"

Sam Elkin
"I can go all day and still feel like I just stepped outside. Nice and warm! They were a present from my wife but we just got a second pair because she was borrowing mine all the time. Fast delivery to upstate [New York] too."

Debbie Aarons
"Wow-- I was amazed at how comfortable these were. It's not that my feet were hot. Instead my feet just felt comfortable. And I work outside with kids so when it's cold I need to be able to stay warm without getting sweaty. I just bought a second pair to keep at work. THANK YOU VERSEO!!!"