Continuous-Use Polyurethane Ergonomic Stool features a heavy-duty mechanism with additional seat and angle adjustments. Recommended for 24-hour continuous use with 15-yr. guarantee. Improved extra-soft form-molded polyurethane ensures comfort, while the steel understructure provides firm support. High impact, molded plastic 27" dia. 5-star base. Backrest depth and height adjust manually. 20" dia. pre-assembled footring. Lifetime guarantee on pneumatic cylinders. Meets or exceeds ANSI/BIFMA standards.