I bought this for running. It's convenient because you can operate your smartphone even when it's in the holder!! Besides your smartphone, there's a pocket that can hold a few cards, so you can put in a transportation IC card and go shopping at the supermarket on your way home! I bought two, but the size was a little smaller than the one I bought before, so I listed it on Mercari! It's super lightweight at 58g and has breathable mesh, so it doesn't get stuffy, but I recommend washing it occasionally. Please note that I've used it about 3 times!!