Kore Executive Black Vinyl Stool Gently rounded ergonomic base allows you to move and flex without leaving your seat Exercises legs, back, and abdominal muscles Relieves soreness and stiffness Great gift for the office The Kore Stool allows the user to flex side to side and front to back - with its patented anti-tip system and gently rounded ergonomic base, the stool allows you to move and flex without falling or leaving your seat. The Kore Stool is great for exercising your legs, back, and abdominal muscles, while also relieving and preventing soreness and stiffness! Adjustable stool seat height (top of seat to floor) 22.5" collapsed, 31" fully extended