Hi Barbara!
You have a great understanding of our product and your feel is correct. This particular style is built on a higher platform than the Z-Strap, so although it does have more material under the foot, it needs to be a little bit firmer for stability purposes. However, after wearing it for a few days you will definitely start to feel it soften up and conform to your feet. I'm convinced you will love them just as much or even more than your Z-straps after a little break-in period.