Thera-Band® Stability Trainers are oval-shaped, color-coded pads supplied in three densities to provide a progressive system of balance training for rehab, post-rehab conditioning and fitness applications.
The Green (Firm, Beginner) and Blue (Soft, Intermediate) pads are molded in closed-cell foam with a ridged surface.

The Black (Extra-Soft, Advanced) PVC pad is inflated with air and has rounded points that provide tactile stimulation on one side. In addition, the Black Stability Trainer has sturdy edges that help prevent ankle-roll, a differentiator in the air-filled balance product marketplace.