Yes the circle is leather and yes it does take some space inside the waist band as all inside the waist do. The large leather surface distributes the area the gun presses on making it almost disappear comfort wise. I have worn the simpler IWB holsters and the gun ends up being uncomfortable. With the Kholster all you feel is the weight, not a gun digging into your side.
I keep mine just behind center on my right side and sometimes further back
If you search Kholster on youtube you will find a number of videos.
Another brand that is similar design is crossbreedholsters.com. I do not own one, but it looks to be about the same. I was so happy with my kholster that I didn’t need to try anymore.
Take care.
Remember that owning a gun is no good if you don’t have it when you need it. An you are more likely to have it, if you are comfortable carrying it.
Thanks for the tip!
The wife and I are going for our CCW training tomorrow!