I was concerned these belts would not stand a chance in the 400 club. They are amazing! I have always worn leather thongs and they never wear for too long without tearing or deforming. I was confused by the plastic buckle. No problem, these belts are amazing. When they can hold the pants of a 400-pound dude who can climb onto a roof, survive a dozen brakes, and flip under-dash wiring without slipping? You have no worries.