I've had extremely good luck with both IWB and OWB Kydex gear from PJ Custom Holsters...
I've heard nothing but good things about
PJ Holsters. The Glock community raves about them. Simple, practical, thin and lightweight; The standard holsters are made with a single sheet of kydex. The tuckable models use two.
They are all hand-made by the owner to the buyers specs, with customizable kydex thickness, ride height, cant, color (including patterns and camo), and belt attachment options. Prices are also very resonable, starting at $50 for holsters and $20 for mag carriers.
In fact, I have one on order for my M&P9c. It's the tuckable model with a 20* cant and standard ride height, along with a tuckable single mag carrier.
His current backlog is about 10 weeks.
Here's his tuckable model.
Can anyone compare a good leather IWB to a good Kydex IWB?
I've gone to 100% leather for IWB and absolutely love it, but I'm here to learn....
.
I've generally carried my 1911s in leather IWB, but I've used a few kydex as well. In my experience, the leather tends to me more comfortable, since it tends to mold to the carriers body. This is especially true of my favorite leather IWB, the
UBG Striker. Leather also tends to be a bit more finish-friendly.
Kydex has the advantage in thinness. A slim gun in kydex simply vanishes. The fact that kydex is rigid also aides in reholstering, where a leather IWB often needs an additional layer at the mouth to keep it open when empty. This makes them even thicker. The other advantage kydex has is that it doesn't retain moisture like leather can.
The biggest downside to kydex is that, in my experience, it's usually less comfortable simply due to being hard, though the aforementioned thinness can lend a measure of comfort all its own. Also, if the holster isn't well-finished, it can have very hard edges that can gouge a gun's finish, jab the wearer, or wear holes in clothing. That said, proper application of heat can allow minor adjustments to a kydex holster. Edges can also be sanded smooth.