Overall: Im a highschool cross country runner, and bought these to do my summer training runs..I was reccomended them at the local running store. Ive run in them twice, 5 miles both times, and have found them utterly miserable. Firstly, theyre heavy and clunky. They made me feel ten times heavier than usual. Also, while they are snug on my forefoot, they are oddly huge on my heel, and have therefore rubbed a blister so severe on the inside of my heel that I had to take them off at the end of my run. The other thing, which Ive never experienced before in a shoe, is how hot they got throughout my run. I run on pavement, and it does get warm, but Ive never felt so uncomfortable due to my feet literally burning inside my shoe. When I took them off, the bottoms of my feet were red. I hate them, and will NEVER buy Puma again.