Large space ergonomic design Enlarged seat designed for adults (22 inches long, 21 inches wide, 51 inches high, adjustable height) Triple support system: adaptive high back headrest + 3D lumbar support + widened arc backrest BIFMA certified military-grade structure, maximum load-bearing 400 pounds. Full scene multi-mode adjustment 90°-155° unlimited tilt + 360° rotating chassis Smart linkage armrest: automatically folds up when lying flat to maintain elbow support Hidden telescopic footrest (extendable to 26 inches), instantly transformed into a nap bed Military-grade comfortable sitting feeling 4D cold foam sponge layer + high elastic spring (density 65kg/m³) anti-collapse Racing-grade breathable hollow back panel, 40% more breathable Fully wrapped side wing design effectively disperses hip pressure Industrial-grade durable structure 20mm thickened steel frame, rubber casters passed 100,000 durability tests Silent universal wheels, passed ASTM roller test (1000 miles we