THE BEST ACTIVE SITTING CHAIR! Rock, swivel, tilt lean, move and burn calories while sitting. Easy to sit on. Fast to get up from. More functional, fun and aesthetic than a balance ball. Takes up a minimal footprint & is easy to move. NEW for 2017! LARGER ROUND FRAMELESS SEAT: Carefully designed in-house, the 13+ in diameter fabric seat is cool, has no frame, and features 3+ inches of premium molded foam cushioning that billows over the edgeless design for enhanced sitting comfort. It's really nice. PERFECT STANDING DESK STOOL: Quickly raise and lower seat height between ~23-33" tall. Extends tall enough to let you "perch" while standing at your desk. Supports your weight, takes the load off your legs and gives you a rest from standing. We designed Wobble Stool to be the best office stool for your stand up desk! PATENTED BASE: Specifically designed to optimize Wobble Stool's function, the rounded base is stable, lets Wobble Stool safely move with you, and rests naturally upright so you can sit "normally" without rocking or balancing. A rubberized coating is non-skid, non-scratch and grips most surfaces. Unique counter-balanced design lets Wobble Stool return upright. ADJUSTABLE HEIGHT ~23-33" | SWIVELS 360-degrees | RESTS upright when not in use | Does NOT require constant balancing | SIMPLE 4-step, tool-less assembly | DESIGNED & MANUFACURED with care exclusively by Uncaged Ergonomics