Wiggle Seat - Inflatable Sensory Chair Cushion for Kids - Certified Ages 6+ - Blue FOCUS - Helps your child stay calm and focused while sitting at school or home MADE FOR KIDS - Certified for ages 6+, don't buy cheap fitness discs. 13" size is a perfect fit for most kid chairs and desks ERGONOMIC - Causes the body to stabilize its self, improving posture SAFE & NATURAL - Certified free of latex and phthalates ADJUSTABLE - Inflation level is adjustable with included pump