--- https://aerocool.io/product/crown-aeroweave/ Model CROWN Maximum weight <150kg Recommended weight <125kg Foam type High density foam Frame type Steel Adjustable armrests Yes, 2-directional Adjustable backrest Yes Mechanism type Tilt control mechanism, single lock Rocking mechanism Yes, 3° – 18° Gas lift class & height BIFMA tested level 4, max. 100mm Base size & type 350mm nylon base Caster size & material 65mm nylon caster Cover material AeroWeave Product weight 18.9kg