The diameter of the piece that sits in your ear is huge with the attached disposable covers. I didn't think I had small ear canals, but this was painful after a few minutes. The sound was acceptable for the price. I removed the plastic cover and it fit much better, but the edges are not smooth and intended for usage without the covers. I also purchased a Plantronics version and am much happier with that one. Same price point. I threw out this one.