I purchased this originally for trail running and it's proven to be a great mud run shoe. I've used it for Run For Your Lives 5k, the Color Run, and most recently, Tough Mudder. During TM, my feet felt fine even after 11 or so miles of trail running, mud, water and electricty. The sole is heavier than most running shoes but its great for running over jagged rocks and it doesn't slip. I'll probably use it for a few more mud runs before donating. I'll definitely buy these again.