This is still popular before marathons. In my last few I got a Tyvek set of pants and hoodie that was lightweight and disposable. About 30 seconds before starti

This is still popular before marathons. In my last few I got a Tyvek set of pants and hoodie that was lightweight and disposable. About 30 seconds before starting the race I stripped them off, bundled them up, and tossed them into the first trash can I saw. They were great for keeping the wind off you and surprisingly good at keeping you warm.