This stool has an internal auxiliary spring design with a secondary spring which enhances easy expansion. The height can be adjusted from 2.4 inches up to 17.7 inches with ease making this a versatile stool for many uses. It has a safety intelligent locking system that ensures stability and safety with a load capacity up to 400 pounds. Telescoping stool folds nicely to fit in the nylon bag which has shoulder straps for easy carrying. A soft and flexible cushion is also included. As well as a cushion that is soft and flexible.