Kore award-winning products are designed to create a better life and work environment. A patented design allows a rocking motion while sitting, encouraging the body to move, which will help strengthen ones core muscles (lower back and stomach) with daily use. Kore Design is a leader in Active Sitting, which enables and increases Secondary Focus keep your body moving so your mind can focus. Originally designed as a class project in design school in the 1970s, the Kore wobble chair is now sold to schools, libraries and offices all across the US, and continues to grow into other countries. The Kore wobble chairs are offered in various sizes, color and material options to suit all ages. Durable plastic chairs range in height from 10" to 18" are suitable for all children, from Toddler to Pre-teen. Stylish adjustable active chairs are available for adults, with two versions: the Office PLUS Everyday that adjusts from 18.5"-26.75" for any office desk or table; and the Office PLUS Standing Desk Chair that adjusts from 21.5"-32" that allows you to easily switch from sitting, to perching, to standing!