Move n' Sit seat cushions are wedge shaped. They come with one side highly textured with small bumps and one smooth side. Level of inflation is easily adjusted with a few puffs of air. Wedge shape offers slightly less movement so safer for those with less secure sitting balance. Also try with wide edge toward front to increase hip flexion or as a back support. Two sizes are available: * Jr/Preschool - (~ 10"x10") * School Age - (~15"x 15") ***This item does not qualify for free shipping.