Master Massage engineers designed this stool for better comfort and design—its saddle nature eases painful pressure on the back. The 6.5cm exclusive Molded foam is specially molded around the seat base, rather than simply glued on. The Master Ergonomic Adjustable Saddle Stool boasts a large, comfortable 360° swivel seat, soft Rollerblade-like Polyurethane wheels (safe for hardwood floors and carpet), and hypoallergenic durable upholstery. The seat's PU upholstery is hypoallergenic, CFC-free and oil and waterproof backed by a 5 year guarantee, making it perfect for dozens of workplaces and professions. Each element of the stool has been engineered for comfort, stability and longevity. PERFECT for professionals and for at home use.