I got a Keis heated jacket (fleece) to go with my Keis heated gloves! With all the snow and ice, I brought a spare motorcycle battery inside and tried it out and to test how they worked. Amazing it was virtually instant heat!! Should work really well on the bike! The wife walked in and laughed at me wearing them in the house. She's only slight, but I got her to try it, wrapping it round her where I needed. OMG said she, I want one………..but you don’t go on the bike, said I………for when I go walking, said she………look a bit funny carrying a motorcycle battery round with you said I!!! 🤣🤣🤣🤣🤣