WOBBLE STOOL AIR is a fun, active sitting chair with a wobbly cushion that helps keep your core engaged and encourages movement while sitting. The simple, lightweight design conveniently rolls into place and is easy to sit on.A BETTER BALANCE STOOL for ACTIVE SITTING: Wobble Stool Air"™s seat swivels 360 and features a unique, flexible cushion that activates your core letting you balance, sway, move and burn calories while sitting. The cushion was specifically engineered to give you both the freedom to move and allow you to sit still "“ so you don"™t have to be in constant balance. Enjoy sitting actively with this fun, modern balance stool.ROLLING BALANCE STOOL for ACTIVE SITTING: Wobble Stool Air is an adjustable height stool (19-25.5"�) with a seat that swivels 360, a unique balancing cushion, and wheels for simplistic mobility. Quickly roll Wobble Stool Air into place and slide it out of the way when you don"™t need it. This simple ergonomic office stool helps you sit healthier and is a sleek, more compact & functional alternative to sitting on a yoga/exercise ball chair.AN ACTIVE BALANCE STOOL FOR ANY ENVIRONMENT: Wobble Stool Air is more compact, elegant and functional than a balance ball chair. The sleek design is easy to sit on, quick to get up from, and fits any environment.WOBBLE STOOL AIR DIMENSIONS:•  Seat Height: adjustable from 19-25.5 in.•  Weight: 12 lbs•  Seat Diameter: 15 in.•  Base Diameter: 18 in.All measurements are approximate.