I had years of sore feet, then plantar fasciitis, then hurt my heels in an accident! I tried all sorts of fancy shoe inserts. My only relief came when I used these! I couldn't believe that something so simple, and inexpensive (they were much cheaper when I started buying them - but I suppose it can't stay like that forever), could be so effective! Really unbelievable. For me, they are just the best. I couldn't live without them. Have a pair in every pair of shoes. Brilliant.