●Multifunctional: can be used as a seat cushion for healthy sitting and as a balance disc for balance training (in standing position) ●Strengthens the back muscles and ensures an upright posture ●Ideal for strengthening childrens attention, bringing peace of mind to sitting ●The thickness can be varied according to training purposes and preferences depending on how much air is in the pillow (from 2.5 cm to 5 cm). Can be inflated with a standard pump (sold separately) ●Can be used on both sides. The studded side provides additional foot and back massage effect. Available in 5 different colours and 2 sizes (diameter 60 cm and 35 cm)