Guys, laugh all you will but I suffered for years freezing my butt off. My wife got me the Heater body suit 4 years ago for my birthday and I love it. I maybe use it 5-6 times a year when it is 20 degrees and windy, but on those days it is fantastic. I only have to wear 2 maybe 3 layers of clothing to stay warm when using the HBS. It reduces alot of weight on my trips in and out walking long distances some times and provides a good comfort level while on stand, thereby extending my hunts. I have killed deer while using it as it is quiet and warm.