It is a reinforced opening style and fits my Springfield XDm 9mm compact nicely. (DH also likes the fact that it is the same size that would fit his Glock 19, in case I did not like it!)
When I first started using this holster, I wore an undershirt between my skin and my waistband. This was a mistake on my part. I could not get the holster to stay in place unless I fastened my belt really tight, which kind of defeated the purpose of this type of holster. I was starting to get disheartened!
Then I decided to use it without the undershirt..... ding ding ding... that worked. I love this holster and it is the one I use about 99% of the time now.
Simple, durable and versatile! Now.... I plan to save up and get some of the magazine holsters!