Herman Miller Mirra 2 Chair: Std Tilt - Fixed Arms - Hard Casters - Alpine Seat - TriFlex Back Features Standard Tilt, Hard Floor/Carpet Casters, Fog Fixed Arms, Alpine Fixed Seat, Fog Base/Studio White Frame and TriFlex 2 Polymer Back Hybrid structure, shaped for dynamic support, keeps your body in healthy alignment A reinvented Harmonic tilt creates a smooth and balanced feel as you move from one posture to another 93% recyclable , 45% of the chair material was derived from recycled resources 12-year Herman Miller warranty with Born-On-Date sticker