NO-GI is without the uniform. (Shorts and a T-shirt) The official NO-GI attire is a Jiu Jitsu Rash guard (compression shirt) and Jiu Jitsu grappling shorts. Also In NO-GI the way we control the human body is slightly different. Instead of using grips grabbing the uniform material we use clinching and other strategies for control. GI can be thought of preparing for self defense in the winter where people have more clothing to control like a jacket or long pants and NO-GI can be thought of as summer where people usually wear shorts and a T-shirt and there is less clothing to use for control.