The PHR (Pocket Holster Revolver) is designed to fit your J-Frame revolver. Other revolver models like the Ruger LCR are available as well.
Smooth side out on the front side without any boning leaves your firearm undectable in your pocket.
Rough side out on the back side helps keep the holster from moving around and coming out of your pocket.
The two hooks on either side of the holster keep it inside your pocket on the draw. The hook on the thumb side is reinforced and designed to be used as a push off point using your thumb.
Retention is minimal for an easy draw.
Credit given to Matt Del Fatti for the base desgin of this pocket holster