I've been using the Tourmaster jacket liner since last spring... and it has been great as a liner and I've been very pleased with the heat on low. I also have the pant liner, but haven't used them as much... will be using them more in the next few weeks as it is getting decidedly cool here in the evenings... will be restricting my night riding once we start getting below freezing... I can ride all day at close to freezing as long as the road is dry... why did I wait so long to buy electric heat? and I've got the dualstar grip warmers... good investment too