Overall I love these headphones The company posted a size chart, I would suggest measuring your foot before ordering to make sure the length is correct. Excellent pair of running socks. I even banged on my desk during a test call and my coworker did not hear it. These were a tiny bit smaller than I thought they would be but still fit. They feel much more well built, and fit and feel MUCH nicer than the $50 Peltors they compete with. I really like it it has more features then the Mi band 3. Check out this headphone as it is probably the best headphones I have heard (and yes, I have more headphones than fingers and toes) that are under $1000, and can get close to ones costing more. My wife likes it a lot. Bluetooth and wired.