Brazilian Jiu-Jitsu is a martial art that can be trained with or without a Gi. The Gi is the traditional uniform worn in Jiu-Jitsu, and consists of a heavy cotton jacket, pants as well as belt. No gi training typically takes place in shorts and a rash guard. No Gi Jiu Jitsu is typically geared more towards MMA training, Gi Brazilian Jiu Jitsu is traditional and is often used to train for competitive BJJ.