Hotronic Foot Warmer S4+ Universal Upgraded Version

Not techie with Bluetooth and such, just a solid foot warmer system for alpine skiing and other cold weather activities. And I'll add I'm a NSP Ski Patroller spending a lot of time outdoors in all winter conditions.

Heat elements have been died both. I don't know why.1st pair lasted 2-3 months, second pair lasted 2-3 weeks,3rd pair lasted 2-3 days. I have just bought 1 pair of heatelements only. I will see how those will go.. disappointing..

Da ich schon den Vorgänger habe und jetzt die neuen.Binn sehr zufrieden damit als Jäger

These heaters were easy to install and worked well. I put them on the 2nd setting in 5 degree weather and my toes were warm. I'd highly recommend these if you have cold toes.

This does not warm your feet. I do not feel the heat but I have not had frozen feet since I installed them. Your toes just feel normal. It adds a little bit of effort to getting your ski boots on and connected. The batteries stay in place and only had to go up to L3 one day when it was below 10 degrees. Game changer and they have added extra life to my ski boots and I no longer complain about frozen toes. I now complain about other frozen parts of my body.