I own one, and if I could afford it (translation: if my wife would let me...lol) I would have one just for sitting on the couch watching TV. They really do work, and are very simple to use. They send you extra "booties" to put on your feet before you climb in, which would help a lot if your feet are prone to freezing up. I don't really use them as i stay warm enough with just the suit. Hope that helps.