The Fundamentals: just like the core techniques that will carry you from your first day on the mat to far beyond your black belt. This rash guard will do the same. Designed for all practitioners and all skill levels. Made to be extra tough and capable of handling many years of wear and tear. Perfect for MMA, Jiu Jitsu, Muay Thai, Crossfit, Lifting, Surfing, and pretty much any and all activities.