From manufacturer description on Amazon:
The BOSU 65 cm Balance Trainer combines all the elements of fitness: cardiovascular, toning and flexibility into unique and highly effective combinations. Challenging and fun, the BOSU promotes moving with control, as you work out on an unstable, dynamic surface.
- BOSU 65 cm Balance Trainer for cardiovascular, toning, and flexibility training
- Smooth nonskid base allows for stability and BOSU training almost anywhere
- Dome side provides ever-changing surface for variety of BOSU balance workouts