Herman Miller Classic Aeron Task Chair: Tilt Limiter w/Seat Angle Adj - Lumbar Pad - Fully Adj Vinyl Arms - Standard Carpet Casters Highly Adjustable Mode: Adjustable Arms, Tilt Limiter and Seat Angle Adjustment, Tilt Limiter Herman Miller's patented Kinemat tilt mechanism lets your neck, shoulders, hips, knees, and ankles pivot naturally. Unique breathable Pellicle suspension dissipates the body heat that builds up while you work, keeping you cool and comfortable, while providing unparralleled support The "waterfall" front edge of the seat takes the pressure off your thighs, so your blood keeps circulating, keeping you alert and focused 12-year Herman Miller warranty with Official Born-On-Date sticker.