The Rumble Roller Manipulates Soft Tissue - Like a Massage Therapist! The surface of the Rumble Roller contains specially designed bumps that are firm, but flexible, much like the thumbs of a massage therapist.
As you roll over the top of the roller, 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. By design, the roller's bumps are firmer than muscle tissue, but much softer than bone, so they deflect out of the way if they contact your spine or other bony protrusions.
The Rumble Roller's smooth, nonporous surface repels most dirt. It's also water-proof and latex free, and includes a molded-in antimicrobial additive that helps prevent the growth of bacteria and fungus.