Herman Miller Classic Aeron Work Stool: Highly Adj w/PostureFit - Adj Leather Arm - Standard Carpet Caster 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 You dont have to climb off the stool to change the footring height, which adjusts separately from the chair height, so that your feet are resting at just the right height when you're seated. 12-year Herman Miller warranty with Official Born-On-Date sticker.