Title: Only connect the batteries in when you’re about to use the socks
Content: I was surprised (and relieved) to see that these are machine washable (without the batteries, of course!), as long as you put them in a cloth bag first. They can also be hand washed in cold water. The charger is a wall charger that charges both batteries at the same time, which is nice. I ordered Medium when I should have ordered Large, but luckily, they fit fine. I got these because I’ve had a hard time keeping my feet warm recently while having a cold, and thought these would be easier (less messy and more mobile) than dealing with hot foot baths to get my feet warm. After charging them, it was too late to try them out then, so it’s usually the morning I have cold feet, so I went ahead and inserted the battery packs into the socks, because it was hard to even get it into the pockets—the battery pack needs to be plugged in before inserting, because it would be impossible to plug it in once it’s in the pocket. There’s no chance of the battery pack falling out of the pocket, as it’s difficult to get it out when trying. I discovered that the socks were already warm when I tried them the first time, then, after being plugged in but OFF all night, so I wonder if they were actually going at low power all night long while off, which makes me think that they should not be connected to the batteries when not in use. I put them both at Red to start, but after a few minutes, one sock automatically changed to Blue, so I put them both at Blue, and a few minutes later, the sock that had automatically turned to Blue, automatically turned itself to Yellow, the lowest setting! So I suspect that these leaked power all night long, so I needed to charge them again. After charging them for several hours, though, the same sock (right sock) again started out at Red, and a few minutes later, I noticed it had turned to Green, while the left sock was still Red. My husband wonders if I bumped against something that triggered the button. I don’t know, but if the app prevents stuff like that, maybe it’s worth using, after all. Most people might use the app with these, but I dislike using apps for everything, personally, and would rather just be able to press it on the sock itself, to quickly discover that the power settings jump around, which is strange. From Hottest to Coolest, the colors range: Red • Blue • Green • Purple • Yellow. But if the socks are on Red, pressing the button to change them will change them to the following: Red — Green — Blue —Purple — Yellow and pressing again will take them back to Red. It’s not very intuitive. They only heat up in the front, not underneath, or in the back near the heel. The socks themselves are thick and comfortable, but not as warm as wool socks without the heat, so I found the rest of my foot getting cooler wearing them after switching to them from wool socks. I think if anyone used these for hiking, it would be wise to wear wool socks over top of these.