if you had to sit all day on a big bucks$ hunt in saskatchawan i might get one. a regular old sleeping bag might do the trick. last winter bow was in the low 20-s with 20mph winds and as long as i had 2 face masks on with pack boots and the 8 hour chemical hand warmers you can tolerate alot. i even have the light mesh vest that holds a bunch of heat packs around your front and back that just makes you feel all toasty. http://www.warmers.com/ItemDetails.a...oryID%7citemid