I have a Warm & Safe Generation 3 jacket liner (size L) and portable 'heat-troller'. I got it from the previous owner of one of my bikes and it works great. I have recently started riding with an Alpine Stars airbag vest, which is unfortunately not compatible - I guess the heat may melt the plastic airbag. I really wish I could keep it because it's great to have heat, but I'm going to put safety first.

The jacket liner is a bit older but is in good condition and I spent some time carefully washing it.This model is still sold by Warm & Safe for $270 with the controller.