The wedge part of the boot seems like it's made out of the gummy shock-absorbing type of material, but it actual makes quite a loud sound when you clip-clop around on a hard floor.

The sizing is not exactly generous.  I wear between an 8.5 and 9, and the 9 in this boot was juuuust large enough.  Any smaller and it would have been a dealbreaker.  Order your normal size, but if you like to wear thick socks you may not be happy.

The best thing about these boots is how small they make your foot look.  It's a neat optical illusion the way the sole cuts inward below the tip of the toe, because your eye registers the shoe as being much smaller than it really is.  So that's a plus.

I haven't decided if I'm going to keep them yet---it's hard to find mid-calf wedge boots for some reason.  They're not extraordinarily uncomfortable, but they're not over-the-top comfortable either.  They're just okay.