I should say that I was already used to barefoot shoes, wide toe-box, and zero-drop shoes, but I was still surprised that I could walk about 7 miles a day on the first two days wearing the Zappy with no discomfort. No hip issues, no knee issues, no ankle or foot issues. Construction feels excellent and I enjoyed watching the videos on YouTube seeing the construction done. Glad they are made in the USA, and especially in Colorado.