Sitting stool with seat height adjustment. Welded steel frame is powder coated for durability and features a wide-angle, tip-resistant base design for student safety. 13"x13" seat constructed from 5/8" thick MDF with thermoplastic laminate finish which is chemical- and impact-resistant. Height adjustable in 1 1/4" increments (21 1/2 to 35") to accommodate students of all ages and sizes. Metal swivel glide feet for easy movement across smooth and carpeted floors. Gives students the option of swinging their legs for continuous movement, which may facilitate better breathing and lumbar support with slouch-free, "open-angled" posturing. Stool can be used with the AlphaBetter® Desk Patented Swinging Pendulum™ Footrest Bar.