SAME AS THE HEADSET THAT COMES WITH STANDARD PHONE. Ill be sending them back. I usually go up a size in slides so my foot never slips off the base. super narrow heal. Great for villa holiday in place with lots of hills I am really upset and I would have rather told the company AH Market before I re-wrote my review. Lo recomiendo para ocaciones en donde no tenemos clóset o armario de manera temporal. I wonder if they came in half sizes, they would be more true to size. Im pairing this with a USB audio solution from an old Hyper X Cloud II. Im not a bodybuilder, athlete, or gym guru.