In short – and perhaps the most obvious point – the uniform! In Gi Classes, you wear a gi. In No-Gi, you don’t! Gi jiu-jitsu, the uniform is a fundamental piece of most techniques and movements. No-gi jiu-jitsu, on the other hand, more closely resembles wrestling. In no-gi classes, you can wear rash guards and board shorts or leggings. While each style has advantages and disadvantages (technically speaking), they share a remarkably similar conceptual foundation and are absolutely complementary to one another in training jiu-jitsu overall.