Standard Vinyl.The Support Stool is an ergonomically designed task stool, which combines unparalleled support with an elegant design. Its unique hydraulic mechanism is the core of the stool's ability to adjust to an individual's personal seating requirements. The back and seat of the stool can be adjusted for height. When set in “free motion” the stool gives full support in any working position. The famous Swedish furniture designer Professor Bruno Mathsson created The Support Stool, and like many of his works it has become a classic. The stool's ergonomic design is so effective that all medical professionals have embraced it. The Support Stool has been in use in the European and American markets for over fifteen years.