I run a lot of races, sometimes in the rain. These work great. They are light weight, inexpensive, and are loose enough so that you won't overheat. I ran a 1/2 marathon with one and only took it off at the last aid station because I knew that I'd be giving extra effort in the last 2 miles and didn't want to risk getting overheated or slowed down by drag from the poncho. But I was comfortable with the poncho on even though I tend to get hot and sweat a ton when running. I keep 2 or 3 in my truck so I can always have one on race day or any day I may get caught in the rain and will be out in it for an extended period of time. tl;dr Great for runners!