A Balance Cushion that will force you to balance while you sit; causing constant micro-movements that will strengthen your core, improve posture and boost circulation. The unique textured surface stimulates blood flow and its compact size allows for easy travel, so you can sit actively anywhere - at home, the office or even on an airplane! Does not include a pump. DESIGN & DETAILS: Convert any chair into an active one Strengthen your core and improve posture Unique textured design boosts circulation Compact size Measurements: 15" Diameter.