Mid-back task chair with posture lock features deeply contoured foam that supports the body for all-day comfort, Control options encourage good posture, Curvilinear back has pronounced lumbar support, Other features include an integral headrest, shoulder-height recess to cradle upper spine, wave-formed seat to provide a natural ""settling in"" place, fully upholstered outer back and five-star base with hooded dual-wheel casters, Functions include pneumatic seat-height adjustment from 16"" to 20-1/4"", back height adjustment, 360-degree swivel, tilt, tilt tension, tilt lock and posture mechanism/lock, Arms adjust in height and width, Super-soft arm pads offer maximum seating comfort, Distance between arms is 20"" to 23-1/4"", Seat measures 21-1/2"" wide x 18"" deep, Back dimensions are 19-3/4"" wide x 21"" high, Mid-back chair is certified by SCS to be in compliance with specific indoor air quality emission requirements and meets or exceeds applicable ANSI/BIFMA standards, SKU: SPRCH28777