The Compound (OWB) is a true hybrid holster and is unique on the market due to fact the holster is constructed so that polymer is not in contact with the firearm. An infused layer of polymer is sewn in between layers of water buffalo leather. 
 
Embedded Polymer Spine
Non-collapsible
Double-Ply Backing
Raised Protective Backing
Vegetable-Tanned Water Buffalo Leather
Industrial Grade Bonded Nylon Thread.
Made in the USA