I have spoken with many pro strongmen about what to go with and they all say METAL. I've heard from guys that have used almost every suit maker out there and still, METAL. Benni Magnusson, Derek Poundstone, Travis Ortmayer, Nick Best, and many more recommend it. The only reason I havent bought one yet is because they suggest getting as far as you can without it and then using it when you near the Pro level.