We needed a way to carry our cell phones when we run. Running pants with pockets seemed to be the solution, but the weight of the phone drags the pants down. This belt is perfect! The husband has worn his running on the road, and I've worn mine on the treadmill, on the road, and in races. It holds the phone, a key, ID, and money. It stays where you put it. It's very comfortable; I never notice it. It's great for running on the treadmill, because I find it's safer to run the wire under my shirt so my hand doesn't catch it, the way it does when I rest the phone on the 'mill. I leave the zipper open a tad for the wire for the earbuds.