The opening is reinforced with sharkskin and serves the same purpose as the covered steel used by some makers. The holster allows for easy one-handed reholstering of the handgun.

Here is the IWB Hi Power holster I "tested." After a couple of weeks wearing the holster and then a range trip, I believe it is safe to say that this is a quality product.
For folks who might be looking for a fine quality IWB holster for their Hi Power, a more detailed report is here:
http://www.hipowersandhandguns.com/IWB% ... olster.htm
Best.