I have had Boot Gloves for years and I use them in addition to Hotronics on really cold days. When mine ripped, I used a neoprene repair kit from NcNett. https://bit.ly/2bgtIAf The repaired areas are actually stronger than the original neoprene.
Just FYI, Hotronics are dual voltage and can be used with a plug adapter in Europe. A good rule of thumb is that if it can be plugged into a car lighter, it's 12 volt and will not be affected by 110/220. Check the plug. A really large adapter often indicates a built-in transformer that reduces the voltage to 12.
Brilliant idea for traveling internationally when one can fry their boot heaters if not using conversion properly.
Just FYI, Hotronics are dual voltage and can be used with a plug adapter in Europe. A good rule of thumb is that if it can be plugged into a car lighter, it's 12 volt and will not be affected by 110/220. Check the plug. A really large adapter often indicates a built-in transformer that reduces the voltage to 12.