Unit is the perfect choice of sitting wedge plus it comes with a filled balance pad. The ergonomic shape enhances thigh support which promotes longer sitting periods during which active sitting can be maintained. With active and dynamic sitting relief to the upper body tension is provided and back muscles are kept active with out exercise. Upright posture is enhanced. Additional features include:- perfect to exercise musculature of back and pelvic floor, enhances an upright posture, pre inflated, free of phthalate and latex, teens and adults use one size, Ø 37 cm. Optional zipped cover available in blue, grey or burgundy, available in black, blue, silver, or red. Complete with exercise poster and pump to adjust to individual pressure if required.