Brazilian Jiu-Jitsu (BJJ) has become a fundamental part of Mixed Martial Arts training. Even though the Jiu-Jitsu Gi isn't worn in MMA, it is a vital training tool which can serve as "training wheels" to beginners and a technical element for experts. Training with a BJJ gi helps learn techniques by providing better grip and reducing the "sweat factor", while adding challenges in your submission defense and positioning.