Work your core and stay engaged with this Uncaged Ergonomics wobble stool. The weighted design is self-stabilizing, while the nonskid bottom prevents you from sliding across the floor. This Uncaged Ergonomics wobble stool is adjustable, so you can achieve the ideal height, and has a cushioned fabric seat for extra comfort. Wobble stool This perfect balance chair is designed for active sitting. You can safely rock, swivel 360°, tilt, lean, and burn calories while sitting. Pneumatic gas lift Lets you adjust the seat height from 23′′ to 33′′ for comfort rest from standing. Vinyl upholstery Provides durability and ease of cleaning. Triangular-shape seat Ensures comfortable sitting. Nonslip base Securely grips most floor surfaces, including carpet, wood, tile, with no marks or dirty concrete. Enables safe sitting. Simple assembly with no tools required.