Its a perfect fit on both ends, and my music comes through loud and clear. I?m usually medium (I?m 5?3 and 135lbs) and they fit great but were just the tiniest bit too long. You put them on and you immediately understand how good earpods are with bass rich sound. I wore these for a week straight all over Cancun, Mexico and my feet never got chafed or sore whatsoever. I got these for a Christmas gift for my dad and he absolutely loved them. I plan to pick up a few more pairs, once I get all my Xmas bills paid off. Loved them but they dont absorb my toner very well and I end up putting a little to much and they d on my break or anything but tiny pieces come off sometimes. When I put them in the case and closed the lid, they almost instantly shut off and disconnected from my phone, I had them on for a little over 4 hours and they only needed about a 1/4 charge! I play 3 times a week 3 hours at a stretch. Its been 4 years since I bought my first pair of these so I dont completely remember, but I think it was the Keen website that has a sizing tool.