Most musical instruments are designed or developed in a time when ergonomy was not very important. Playing these instruments for hours on a stretch can cause various problems in the muskuloskeletal system. Carpal tunnel syndrome, dystonia, scoliosis, or just pain in the neck or thumb , numbness in the hand, to name a few.
DeGrav (short for Deny Gravity) takes 100% of the weight of the instrument out of your hands, making playing, as well as hands, wrists, arms more relaxed.