On Drop. If I could have found the Dewalt branded tracks, I would have bought those instead and would advise the same. 3) Build Quality & ComponentsThe build quality is surprising. cannot recommend enough! I’m so happy I got this. I ordered a large! This was not made clear. Probably would not work for phone calls. Ill tell you how I was able to do it. After wearing a few hours, they open up to your foot exactly, and fit perfectly.