These new rules baffle me. My good old Uncle Mikes cost $17 w/tax. Now I gotta spend $$$ for a new holster. As to your question I think you'll only find out the next time you shoot an IDPA match. I wonder about the "thinnest" in the product description. From the new rule book: "G. Must be constructed of normal thickness common holster making materials (leather, Kydex, plastic, nylon, etc.)." So, what is normal thickness? Hopefully you won't have some jerk measuring the thickness!