I had to go down one size
I first ordered the Large as my calf measures 14.5 just below the knee and 16.5-17&#34; at the widest over the muscle. I sent back and ordered the medium and these fit much better. I'm not sure how tight they are supposed to be but there was still room to stretch. I haven't had them very long or had a chance to test while exercising as I recently tore my calf. Once I get the top strap over the calf, it's a little tender to touch right now, the compression feels great and I can feel the added heat during this time when circulation isn't very good with the muscle not contracting.
Rating: 4 stars