This mesh back task chair with a vinyl upholstered seat is perfect for offices, conference rooms, seminars and more. Ergonomic design with nylon mesh back conforms to body for cool, ventilated and supportive comfort. Plastic trim backrest ensures long-lasting durability and built-in lumbar support provides added back comfort. Ratchet back height adjustment allows easy backrest height adjustment 1-1/2 inches. 18-1/2" square vinyl upholstered seat has comfortable 3-3/4" thick cushioning is covered in long-lasting, durable vinyl upholstery for an attractive look. Waterfall contoured seat helps to reduce stress on knees and helps ensure proper circulation. A contoured back provides lumbar support and encourages proper posture.