I have no doubt leather belts are more supportive then woven belts BUT that is only a real factor with less than optimal holsters. I use holsters with wide belt loops, outside the holster body, for more stability. I use 5.11 instructor belts for carry. They are infinitely adjustable so they are never too loose or too tight. Too stiff a belt can be pretty uncomfortable if you ask me. I bought one of the double layer belts from 5.11 thinking the extra stiffness would help support the weapon but I couldn't tell any real difference other than it was less comfortable. I sure your mileage may vary depending on your body type/shape but that is what works for me.