These gloves Rock! I love them, "being portable" saves me a ton on upgrading all of my bikes with heated grips-- just bought last Sept. rode into December ( MN ) The batteries seem to be the weakest link,( I have on high all the time) a good area and opportunity for improvement . Thinking about buying wife & myself the vests, using those batteries for extras on my gloves and upgrading to the larger batteries for the vests. As always-- if it has two wheels ride it enjoy it!!