Jumper : sweater that paratroopers wore for jumping out of planes. I’ve always called them Sweaters though because until lately I’ve always been overly hot and sweated every time I wore one. If you live someplace very desirable where the weather is beautiful the majority of the year ? There will be numerous things residing there that can kill you as well as frequent weather occurrences that could do it as well. If you live in Michigan ? Avoid cheese and carbs as you sit inside watching TV and if God provides you a 50° day in in December ? Fer chrissakes get on your Bad Motor Scooter and ride .