|From time to time, the subject of shoes comes up on PR, so I feel somewhat justified in including this suggestion.
I have impoverished myself over the years, buying heel guards and various kinds of shoe inserts in an often vain attempt to make a Medium shoe feel like a Narrow or keep my foot from sliding too far forward in shoes and sandals. Sometimes they work, sometimes they don't. When I need just a little bit of beefing up in the heel or under the ball of my foot, ultrasuede is often just the right thickness. I cut it out using Dr. Scholl's (or other brands) as a pattern, tape the ultrasuede in place to check fit and placement, then cement it into the shoe when I know it's where I want it to be. They're cheaper and less bulky than commercial shoe thingies (technical term.) Save those scraps!