Sihoo M57 vs M59AS: Which Ergonomic Chair Fits Your Needs?

Sihoo continues to dominate the affordable ergonomic chair market with mesh designs that prioritize breathability and support for long sitting sessions. The M57 is a longtime favorite for its reliable build and precise adjustments, while the newer M59AS introduces innovative features like a dual-section backrest and space-saving elements. Both excel in home offices or remote work, but key differences in ergonomics, comfort, and practicality set them apart.

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Design and Build

The M57 boasts a classic full mesh backrest and seat for maximum airflow, paired with a sturdy aluminum alloy base. It supports up to 330 lbs and feels premium with a minimalist look.

The M59AS features a dual-section (split) backrest for better contouring to the spine, a saddle-shaped mesh seat for thigh pressure relief, and practical additions like an integrated coat hanger. Its flip-up 3D armrests allow easy tucking under desks, ideal for small spaces. It handles around 300-330 lbs with BIFMA/SGS certification.

Ergonomics and Adjustability

Both offer adjustable headrests, recline (up to ~126°), and strong lumbar support, but approaches differ.

• Lumbar: M57 has dual-manual adjustable (height and depth) for precise tuning. M59AS uses dynamic/adaptive lumbar that moves with you, plus fore-aft adjustment.

• Armrests: M57's 3D (up/down, forward/back, pivot). M59AS adds flip-up and coordinated linkage for better recline support.

• Seat: M57's flat mesh is highly breathable; M59AS's saddle shape reduces leg pressure.

The M59AS feels more "modern" and adaptive for dynamic sitting, while M57 suits those wanting manual control.

Comfort and Verdict

Users praise the M57 for superior cooling and durability during 8+ hour days. The M59AS shines in adaptive support and convenience (e.g., coat hanger, space-saving), making it great for varied postures or compact setups. Assembly is easy for both (~20-30 mins).

Pricing varies, but M59AS often competes closely or undercuts the M57 on sales.

• Pick M57 for maximum breathability, manual precision, and proven longevity.

• Pick M59AS for innovative adaptive features, space efficiency, and modern comfort.

Both outperform many budget chairs in ergonomics—choose based on your sitting style for better posture and productivity.