9 years & up. The K-Motion Stool provides a unique and functional seating option featuring a lightweight, durable body with a convex base that is designed to move in all directions. This ergonomic stool can be used as a physical outlet for children and adults who need movement to focus while sitting. The sturdy, padded base provides comfort and prevents slipping. Seat measures 18" high. Maximum weight limit: 250 Ibs.