I ordered the small version and fits much better, a little bit tight but not too much
I bought this as a replacement of the Garmin HR soft strap that came with the Garmin Edge 520. I always had issues with the previous one as it was a little big and it would slide down. It started  failing (not reading anything) so here I am. I ordered the small version and fits much better, a little bit tight but not too much. For reference, it is 28&#34; long when extended. It can be split easily (unlike the Garmin one which is one piece) and has more stable readings;<br />the Garmin used to have higher readings and erratic at times. Just to clarify, I continue to use the Garmin sensor and works fine with this strap.
Rating: 5 stars