The RumbleRoller Manipulates Soft Tissue bringing relief of pain and tension. The surface of the RumbleRoller contains 200 specially designed "bumps". The bumps are firm, but flexible, much like the thumbs of a massage therapist. As you roll over the top of the RumbleRoller, the bumps continuously knead the contours of your body, gently stretching soft tissue (muscle and fascia) in multiple directions. This action erodes trigger points, helps restore flexibility, and brings quick relief to common types of muscular pain.