I use one on my tracking dog to help protect her from some very nasty briar thickets. Seems to work real good. Even though she is only working 30 feet out in front of me on lead she is hard to see with out it exspecially at night. The bright colors that the one I have helps me keep up with her. I have not had a problem with her over heating in it but then most of the time she is only in it for 1 1/2 -2 hrs at a time.