Sihoo M57 Review

Last updated December 2024

Best Feature Set Under $300

The best budget ergonomic chair with adjustable lumbar and 3D armrests.

4.2 / 5 (876 reviews)

300 lbs · Mesh Back · 3D Armrests · 2-Year Warranty

Quick Verdict

The Sihoo M57 is the gateway drug to ergonomic seating. For under $260, you get adjustable lumbar, 3D armrests, and breathable mesh — a feature combination that simply does not exist at this price point from any established brand. It is not perfect, but it is the best place to start your ergonomic journey.

— ChairNerd Editorial Team, after 100+ hours of testing

Rating Breakdown

At a Glance

The Sihoo M57 is the chair that proves you do not need to spend a fortune to get genuine ergonomic features. At roughly $250, it occupies a price bracket where most competitors offer little more than a padded seat and a backrest. The M57 breaks that mold by delivering adjustable lumbar support, 3D armrests, and a breathable mesh back — the trifecta of entry-level ergonomics.

Sihoo is a Chinese manufacturer that has built a strong following in the budget ergonomic community through sheer value. They are not a legacy brand like Steelcase or Herman Miller, and their warranty reflects that — just 2 years compared to the 5-12 years offered by competitors. But the M57 has amassed nearly 900 reviews with a 4.2-star average because it delivers where it counts: keeping you comfortable during long work or study sessions. See how it compares in our best chairs under $500 guide.

We recommend the M57 primarily to students, entry-level remote workers, and anyone furnishing their first dedicated workspace. It is also a solid choice as a secondary chair for a guest office or as a stepping stone to gauge whether you will actually use ergonomic adjustments before investing in a premium chair. The M57 gives you a genuine taste of what proper ergonomics feels like without the premium price tag.

Key Specifications

In-Depth Review

Comfortable for the Price, With Caveats

The M57’s seat uses high-density foam that provides adequate support for 4-6 hour work sessions. It is firmer than you might expect from a budget chair — a good thing, as soft seats collapse under body weight and create pressure points. That said, the foam density is noticeably lower than what you find in $500+ chairs, and heavy users (200+ lbs) may find the seat compressing more quickly over time.

The seat depth adjusts from 15.5” to 17.5”, which accommodates users from approximately 5’2” to 6’2”. Shorter users will appreciate the ability to bring the seat forward to maintain proper back contact. Taller users may find the 17.5” maximum depth slightly short for full thigh support. If you are over 6’0”, we recommend testing the seat depth or considering the FlexiSpot C7 which offers a deeper range.

The mesh backrest is the M57’s standout comfort feature. The woven nylon mesh provides excellent ventilation, keeping your back cool during extended sitting periods. The mesh tension is appropriately firm — it supports without creating a hammock-like sag that can cause postural issues. After testing in a warm office environment, we found the M57’s breathability comparable to chairs costing three times as much.

The Lumbar Pad: Static But Effective

The M57’s lumbar support is a curved plastic pad covered in mesh that slides up and down the backrest via a hand-operated lever. You can position it anywhere along a 3.5-inch range, which is sufficient to hit the natural lordotic curve for most users between 5’4” and 6’0”. The pad itself has a gentle curve that matches the spine’s natural shape reasonably well.

The key limitation is that this is a static pad — it does not move or flex with your spine as you shift positions. When you sit perfectly upright, the support is excellent. When you recline or shift to one side, the pad maintains its position rather than following your back. This is a meaningful difference from dynamic systems like the Leap V2’s LiveBack or the Aeron’s PostureFit SL, which respond to movement in real-time.

For the price, however, the presence of any adjustable lumbar support is remarkable. Most chairs under $300 either omit lumbar adjustment entirely or include a useless elastic band that provides no meaningful support. The M57’s pad genuinely helps maintain proper lumbar curvature and reduces lower back fatigue during long sessions. Our testers with mild back discomfort reported noticeable improvement versus their basic task chairs.

3D Armrests on a Budget

The M57’s 3D armrests move up and down through a roughly 3.5-inch range, slide forward and back, and pivot inward at approximately 15 degrees. The height adjustment is the most important feature — it allows you to position your arms at a 90-degree angle for typing, reducing shoulder and neck strain. The depth adjustment is useful for different desk depths and sitting positions.

Let us be direct about what you are getting. These are not premium armrests. There is a slight wobble in the connection point that you will not find on a Steelcase or Herman Miller chair. The padding is adequate but not plush. The adjustment mechanisms require a bit more force to operate. But they are adjustable in three dimensions on a $250 chair, and that is genuinely impressive.

The recline tension is adjustable via a knob beneath the seat, and the tilt lock lets you secure the chair in an upright position. The recline range is moderate — enough to lean back for a phone call or a moment of relaxation, but not the deep recline you would want for lounging. At this price point, the recline functionality is a nice bonus rather than a headline feature.

Acceptable Quality, Understandable Compromises

The M57’s frame is a reinforced nylon polymer, and the base is a five-star nylon design with 2-inch dual-wheel casters. The overall package feels solid enough for daily use, though you will notice the difference if you have sat in premium chairs. There is a slight flex in the backrest frame under heavy load, and the armrest attachment points have minor play. Nothing alarming, but present.

The 300-pound weight capacity is honestly impressive at this price. We tested the chair with users up to 260 pounds who reported stable, comfortable support. The gas lift operated smoothly throughout its range, and the base showed no signs of stress. Sihoo could have cheapened out here with a 250-pound rating like many competitors, and we appreciate that they did not.

Our long-term durability prediction: with normal use, the M57 should last 3-4 years before showing meaningful wear. The 2-year warranty covers manufacturing defects but not wear and tear. The seat foam is the component most likely to show age first. For a chair at this price point, that lifespan represents reasonable value — $250 over 4 years is about $5 per month.

Simple Assembly, No Surprises

The M57 arrives in a single box weighing about 50 lbs with the seat, backrest, base, gas lift, casters, and armrests as separate pieces. The included instruction manual is clearly illustrated, and all necessary tools are provided — a hex key and a small wrench. The process is straightforward: attach casters to the base, insert the gas lift, bolt the seat to the mechanism, attach the backrest, and screw on the armrests.

Most users complete assembly in 20-25 minutes. The trickiest part is aligning the backrest brackets with the seat mechanism — having a second pair of hands for 30 seconds makes this much easier. The armrests attach with four screws each and are the most time-consuming step. Pro tip: do not fully tighten any bolts until everything is aligned, then tighten in sequence. This prevents the minor frustration of misaligned holes.

Unbeatable Value for Entry-Level Ergonomics

The Sihoo M57 exists in a category of one. At $249, no other chair offers adjustable lumbar support, 3D armrests, and a breathable mesh back. The nearest competitor with comparable features is the FlexiSpot C7 at $399 — $150 more for a 5-year warranty, slightly better build quality, and easier assembly. Both are excellent choices, and the decision comes down to budget.

For students, entry-level remote workers, and anyone on a tight budget, the M57 is our top recommendation. It provides enough ergonomic adjustability to meaningfully improve your sitting posture and reduce fatigue, at a price that leaves room in your budget for a desk, monitor, and other essentials. Think of it as an investment in understanding what ergonomic features matter to you — after a year with the M57, you will know exactly what you want in your next chair, whether that is a $400 upgrade or a $1,400 premium option. Read more in our budget chair guide.

Complete Specifications

Where to Buy

• Amazon — $249 (Prime shipping)
• Sihoo Direct — $259 (Direct warranty)
• Walmart — $269 (Store pickup)

You Might Also Like

• FlexiSpot C7 — If you can stretch your budget to $400
• Steelcase Series 2 — If you want Steelcase quality for less
• Steelcase Leap V2 — If you want the best ergonomic chair available

What Our Readers Say

I bought this for my dorm room and it’s been great. The lumbar support actually adjusts and the mesh keeps me cool during all-night study sessions.

— Kevin L., Graduate Student

Switched from a $100 basic chair and the difference in my posture is real. The armrests adjust to my desk height and my shoulders aren’t tense anymore.

— Priya S., Junior Developer

For $250, you can’t beat it. Assembly was easy, everything works as advertised, and my back pain from my old chair is gone. Will upgrade to a Leap eventually, but this is perfect for now.

— James W., Remote Sales Rep

Methodology: This review is based on 100+ hours of hands-on testing by our editorial team, combined with analysis of 876+ verified owner reviews and lab measurements. We may earn a commission through affiliate links at no additional cost to you. Learn more.