^^Agree, There is definitely a big size difference. I don't have pics, as I don't have the small one anymore, but I have had the medium size for awhile and it is perfect for me. The small however was way too small for me. The measurements don't look that different but there is a really big difference on the arm for me. However, I have never talked to anyone who found the medium too big so it might be worth taking the plunge!