Herman Miller Classic Aeron Task Chair: Tilt Limiter w/Seat Angle Adj - PostureFit Support - Fully Adj Vinyl Arms - Hard Floor Casters 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 The pioneering PostureFit mechanism supports the way your pelvis tilts naturally forward, so that your spine stays aligned and you avoid back pain 12-year Herman Miller warranty with Official Born-On-Date sticker.