I have gone through a few belts trying desperately to find one that doesn't bounce while I'm running. This one finally did it! I use it in summer for running and winter for cross-country skiing and it's perfect for both sports. Bonus that it's water proof so my sweat (or an unexpected rainfall in the summer) doesn't soak through to my phone. I've used this for almost 2 years now and it hasn't stretched out or anything. Ordering a second one now for my husband and will get another one for myself once I need one. Thanks for making a good design!