Excellent product! I bought it in April 2019 as a last resort for my chronic peroneal tendonitis that has been bothering me and making even simple walking painful. With the use of the brace, the pain has been eliminated, at least during walking. I haven't tried running again yet. It keeps the ankle and the surrounding tendons and muscles stable, preventing any inward or outward rotation. Excellent construction quality, an Icelandic company indeed. And perfect fit, although according to the measurements suggested by the company's website, I was between M and L (I ended up choosing M). It fits comfortably in all my athletic shoes, but not in the more rigid and narrow casual ones. After a few uses, you get used to it and don't even feel like you're wearing a brace.