700mm aluminium base for stability with twin wheel hooded castors Heavy duty gas seat height adjustment 154kg (25 stones) A generously proportioned unpholstered seat with pronounced waterfall front High mesh backrest with adjustable lumbar support for additional user comfort Substantial reclining knee tilt mechanism with tension control for individual body weight Breathable high mesh backrest allows improved ventilation Fully adjustable headrest and height adjustable armrests fitted with armpads for extra comfort