• Easily switch between working mode and relaxation mode with the linkage armrests• 20"-23.5" adjustable seat height allows customization for optimal ergonomic comfort• 90°-135° adjustable backrest supports various reclining positions to reduce strain• 2 convenient levers allow for easy height and recline adjustments • Elastic sponge filling provides ultimate comfort for working• Premium plywood brings reliable bottom support for sitting • Provide ergonomic support for the shoulder, back, lumbar, arm, hip and leg• Offer reliable support for extended office hours with a sturdy 5-point base• SGS-certified gas cylinder ensures effortless height adjustment• Achieve smooth and convenient mobility with smooth universal wheels• Tight double stitching securely fastens the fabric for long-lasting use• Can be used as an office chair, conference chair, study chair or gaming chair• Assembly needed• Black:• Seat and back cushions made of PVC leather, sponge filling and plywood• High-quality PVC leather offers simplified maintenance• Gray:• Seat and back cushions made of linen fabric, sponge filling and plywood• Wear-resistant linen fabric offers dependable long-term use