Hi Kristen. I' ve tried the " Heater Body suit" . I didn' t buy it myself, 1 of the guys in my camp who HATES the cold bought it and he tagged out before I did last year. It doesn' t have any batteries or wires or anything .. it is HUGE though, like a sleeping bag, and it had back pack straps. The suit had legs and extra insulation around the feet, and it didn' t have any arms just zipped up like a sleeping bag. If you hunt from a tree stand you better have a bow hook as you' re a mummy and need to unzip it and slide it down before you can grab anything. The zipper was on the inside and was quiet to open which surprised me.

They are not kidding .. you WILL NOT get cold. In fact I found I didn' t need it zipped up at all and I was toasty. I took my buddies advice and under dressed for the walk in and I could have been in shorts and a tshirt and been comfortable. My biggest problem that day was staying awake I was so warm and comfortable.

The negatives .. it' s HUGE. If you take the time to roll it up tight before the walk in it' s not to bad. But on the way out .. just like carrying a sleeping bag over your shoulder. If a deer were to surprise you .. very possible because you are probably napping in warm bliss ... it isn' t the quickest thing to slowly unzip and slide out of for a shot.

On a real cold day it' s awesome. In fact I blew it by raving about it and then lost it for the next day.

A cheaper alternative which would probably work just as well is what we used to do in the Marines and use our sleeping bags. The feet in the suit are nice and toasty though.