THERABAND Professional Latex Resistance Bands are available in eight color-coded levels of Progressive Resistance. This original progressive resistance system has been recognized as the highest quality natural rubber latex resistance band for over 40 years. Proper use of these systems for resistive exercise provides both positive and negative force on the muscles improving strength range of motion and flexibility. Color-coded progressive resistance gives at-a-glance documentation of progress from one level to the next and allows the user to progress as they get stronger.