I have been skiing for about 35 years and have always had cold hands and feet at some point during the day and sometimes all day. My son gifted me these socks and what a lifesaver! We just returned from a 10 day ski trip to Whistler and the socks were a lifesaver. It took me a time or two to decide the best way to use the socks to conserve battery life for all day. I did not turn them on until my toes were a tad bit cold and made sure I turned them off when in the lodge. Some might say this is not efficient for the socks but it worked very well for me. If you can use them at the lower temperature, it helps with battery life as well. A great feature is that I could download the Lenz Heat App to control my socks on my smartphone. This was a game changer as well because it would have been difficult to manually turn the heat on my socks up and down. The app also allows you to set intervals for heat earth which is also great for battery life. I would have the socks heating for 10 minutes and off for 10 minutes and back and forth. The socks are a bit on the expensive side but I feel it was money well spent. The flexibility of adjusting heat levels with use of the free app justified the price point for me. Should you invest in warm feet, I hope you enjoy them as much as I do!!