I wished I would’ve had these the other night for our late, late ride. Starting at 9:30pm near the lakefront trailhead in the winter isn’t the coziest way to get going, and halfway through the ride my feet were pretty chilled. Some friends have stuffed chemical heat packs over the top of their feet, but ThermaCell’s heated insoles with rechargeable Li-Ion batteries, remote control operation and two heat levels seems like a much better idea to me.
They’re good for up to five hours of continuous use per charge, and the built-in batteries are good for 500 full charge cycles. In other words, even if you use them every day in the winter, you’ll still get a few years out of them. They claim they’ll heat to 100º on medium and 110º on high, turning themselves on and off automatically to maintain that temperature. They’re water resistant and can be trimmed to fit. They’re available in five sizes to fit US shoe sizes 4 to 13. Retail is $129, but you can find ’em online for less.