Compared to the other pair of heated socks I own these seem better in a few ways: 1. They have a more robust construction. Similar to a hiking sock they have different stitching and weaves at different points in the sock to better fit the foot. 2. The batteries are bigger 3. They got hotter and warm faster 4. There is a flap that secures the battery in the pocket 5. There is a haptic feedback when you change the heating settings. This is great when you can't look down at the lights 6. There are more places on the foot heated I wear a size 13 and ordered the XL They go up to the upper calf and are a little tighter than I would prefer. My calves aren't huge but getting them on still takes a little work. I love that the USB-C interface is used instead of something proprietary. I can charge with my many USB-C chargers. It seems to charge at 12W. I was able to test with a generic power bank and it worked. However I wish the controls were not on the battery so I could use a different battery. Connecting a standard battery does seem to cause heat, but I am not sure at what level....seems like probably high.