The Junior sized Move N Sit Cushion is intended for use as an aid to a comfortable and secure posture. It is particularly helpful for children who might otherwise be prone to slumping in their chairs. The cushion is wedge shaped and inflates easily to the desired firmness by blowing or by using a manual pump. A larger size is also available. One Move N Sit Cushion Size: JUNIOR Good for users with limited muscle tone in their trunk Deflates easily for storage