Alera ALEEL42ME10B 17.7 in. 21.4 in. Seat Height Elusion Series Mesh Mid-Back Task Office Chair Supports up to 275 lbs. BlackMultifunction mechanism with seat glide allows back angle adjustment relative to seat, adjustable tilt (free floating or infinite locking positions) and forward tilt. Cool, breathable mesh back Contoured seat cushion with waterfall edge to help relieve pressure on legs Height- and width-adjustable arms with soft polyurethane pads Five-star base with casters for easy mobility Height adjustable ratchet back for optimal lumbar support