Used these on a cold day at full heat and felt the heat instantly. Also used them without the heat on and they were still a nice ski sock and average for warmth

So I previously owned another well know heated sock brand. This one is far and away a better product. Considerably warmer and a much better fit.

I suffer from chronically cold toes. Have since I was a little kid. This is my first foray into heated socks and I could not be happier. Easy to use, long battery life, and tested on a full day skiing at -18 Celcius.

The socks fit well, appear to be of excellent quality and keep me warm. I like the fact that the heat level can be controlled either manually or with my phone. As an older person I also appreciate that the instruction manual is clearly written and easy to understand.
I ski in the Canadian Rockies and have found that the model 1400 batteries I purchased with the socks provide all day warmth in even the coldest temperatures.

Excellent, warm and thin