MZLEE Ergonomic Executive Office Chair Swivel Work Chair Computer Desk Chair with Flip-up Armrest, Adjustable Height (Black)Excellent Ergonomic Chairs Improve Your Posture The backrest and seat of this executive office chair is filled with a soft, elastic sponge and features the powerful waist support system to keep your body at relax and give you a deeper level of comfort. Durable & Stable The desk chair BIFMA certified features breathable fabric, three stage steel gas spring certified by SGS and a sturdy steel base, a max capacity of 150kg. Special Wheels for smooth