Most electric gear, until recently, was just wires. I wear a long sleeve shirt under my heated jacket, and have never had a problem with burning. Once, I wore a short sleeve shirt, and had some red marks on my arm, but it was nothing to worry about. I don't ride when it's near freezing, because I don't want to ride on ice. However, I've never been cold when wearing my electric (Warm n Safe) jacket. I live in the Bay Area, on the warm side. It's not unusual to be 80 degrees in Oakland on a summer afternoon, and 40 degrees in SF at night. This is why I have electric gear - I can ride to work in a shirt and armored jacket, and ride home with a shirt, electric jacket and armor. I also ride from here to Southern Oregon a few times a year, and it can be really cold on the way there.