Rash Guards are ideal for those who train no-gi BJJ, grappling or MMA. Many martial artists who train in the gi also wear a rash guard underneath. The rash guard prevents chafing and wicks away sweat from the body during training. The stretchy, compression fit makes it a perfect choice for those grappling without the gi. Rash guards also act as a barrier against the mat and other people's skin, helping to protect the wearer from skin infections such as ringworm.
Rash guards comes in both short sleeve and long sleeve, as well as unisex fit and ladies fit. The choice depends upon your needs. Some people prefer to train with a short sleeve rash guard in the summer, and wear a long sleeved one during the winter, but it all depends on your preference.