"90°-110° adaptive rocking function with tension adjustor for dynamic sitting. Thick padded headrest & double-layered seat cushion (high-density foam + rebound sponge) for cloud-like comfort during 8+ hour workdays. Extra-wide 22"" (55cm) seat width & 19.7"" (50cm) depth with anti-skid fabric.Seat height adjustable (28""-31"") and flip-up armrests save space in compact home offices. Heavy-duty castors glide silently on hard floors – no mats required.28.3"" (72cm) base width ensures superior stability (supports up to 150kg) Tilt tension knob fine-tunes rocking resistance.45.3""-48.4"" (115-123cm) backrest height suits users 160-190cm tall Industrial-grade nylon frame & reinforced stitching prevent cracking.29.5"" (75cm) depth base with anti-tip design for ultimate safety"