Reflex Task Chair without arms features spring-back lumbar support and is upholstered in flame-retardant, textured fabric. Seat back measures 19" wide x 16-1/2" high. Chair seat pneumatically adjusts from 16" to 20". Other functions include seat-depth adjustment, 360-degree swivel, tilt, tilt lock and posture/mechanism lock. Task chair features a five-star base with dual-wheel, swivel casters. Arms are sold separately.