Ok, so on 60 minutes there is a feature on twin brothers that are doubles, tennis champions. They say there is a 1" height difference. I was shocked .... you could really tell the difference. WalkTall shoes have a 1.6" heel on the outside & 1" on the inside= 2.6" total. I did not think it would really be a big difference for me. But now I KNOW, 2.6" is undoubtedly noticable. I am more excited than ever to be L.L. 4" + WalkTall shoes.