... using these inserts are as important as the shoe selection. I place a set in all my athletic, hiking, biking, and daily use tactical boots. I have naturally High Arches and buy my shoes a half size larger to accommodate this insert. For the long term health of your feet, ankles, knees, and back; these are a must along with a thin shock absorbing pad depending upon the intended use. How much is your Pain Free ergonomic health worth? ... I'll buy a pair of these with every shoe purchase to replace the useless insert that comes in most shoes :)