Ergonomic chair – this model includes adjustable seat depth, fully adjustable arms, adjustable lumbar, pneumatic seat height adjustment, recline tension adjustment, flexing back with mesh upholstery and upholstered seat All day comfort and back support – back technology features flexor system in the backrest conforms to your body and moves with you to support the spine as you change postures. The weight-activated tilt mechanism responds automatically as you sit and move to ensure long-term support Fame Fabric is 95% Wool, 5% Polyamide (OEKO-TEX and EU Flower certified), Abrasion Martindale 120000 cycles EU Flower certified), Abrasion Martindale 120000 cycles Wheels: best suitable for hard floors (parquet, tiles, etc.) or soft floors (carpets) Easy to assemble: 12 years manufacturer warranty; Made in France