SIHOO M18 vs GABRYLLY Mesh High-Back: Which Office Chair Should You Buy?

Our pick

SIHOO M18

4.3★ · 17,197 ratings

• Your lower back aches and you want lumbar you can move
• You weigh close to 300 lb and want the 330 lb rating
• You want a chair that independent testers rated higher (66 vs 62 at GearLab)

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GABRYLLY Mesh High-Back

4.5★ · 14,333 ratings

• You run warm and want mesh on the seat as well as the back
• You're tall and need the seat to rise to 23.6 inches
• You want armrests that flip fully out of the way

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VS

These two chairs look almost identical in a product photo: black mesh, a winged headrest, a big curved back. Both sit in Amazon’s top 15 desk chairs and both have more than 14,000 ratings. The deciding question is simple. Do you need lumbar support you can adjust?

The deciding difference

The SIHOO M18 has a separate lumbar pad that moves up and down and in and out, worked by a knob behind the back. GearLab named it a best buy for back support and gave it 66 points.

The GABRYLLY has a fixed S-curve. GearLab’s testers rated its mesh seat comfortable but found no real lumbar support, and scored it 62.

That’s it. Most of the other differences are about body size and temperature.

Side by side

	SIHOO M18	GABRYLLY
Lumbar	Adjustable pad	Fixed curve
Seat	Foam under fabric	Mesh, 20.5 × 20 in
Seat height	Not listed	18.9–23.6 in
Weight limit	330 lb	300 lb (GearLab: 280)
Chair weight	31.5 lb	41 lb
Warranty	3 years (parts)	3 years

Where they differ

Seat. The SIHOO uses a foam cushion. GamingTrend’s reviewer measured it at about 3.35 inches thick and found it comfortable through long office sessions. Owners are less sure: 48% of 223 firmness mentions are positive, and a common complaint is a seat that hardens after hours. The GABRYLLY’s seat is mesh, which breathes better and can’t bottom out.

Size. The GABRYLLY is the larger, heavier chair, and its seat climbs higher. Tall people win. Short desks don’t.

Arms. GearLab notes the GABRYLLY’s armrests fold away completely, handy if you push the chair under a desk. The SIHOO’s arms adjust for height.

What owners report

The GABRYLLY wins on build and setup: 92% of 3,718 quality mentions and 97% of 1,839 assembly mentions are positive. Its weak spot is stability. Only 27% of 497 stability mentions are positive, the worst share of any topic for either chair.

The SIHOO’s best topic is lumbar support, at 78% of 501. Durability is its problem, with 62% of 221 mentions negative, often about armrests. GearLab’s testers also found its knobs stiff and its wheels slow to roll.

Verdict

For an 8-hour day with a cranky lower back, get the SIHOO M18, accept that the knobs are stiff and the armrests are its weakest part, and register the 3-year parts warranty the day it arrives. Back fine? Run hot? Then the GABRYLLY makes sense.

Where they differ

Spec	SIHOO M18	GABRYLLY Mesh High-Back
Amazon rating	4.3★ (17,197)	4.5★ (14,333)
Back	Mesh, S-shaped	—
Seat	Foam cushion	—
Lumbar	Adjustable pad (knob on back)	—
Armrests	2D height-adjustable	Flip-up
Tilt	Recline with tilt lock	90–120°, 3-stage lock
Weight limit	330 lb	300 lb (listing)
Chair weight	14.3 kg (31.5 lb)	41 lb
Warranty	3 years (replacement parts)	—
Back and seat	—	Mesh
Seat size	—	20.5 in wide, 20 in deep
Seat height	—	18.9–23.6 in
Recommended user height	—	5'2"–6'1"
Price	Check price	Check price

What owners say about the SIHOO M18

Topics mentioned most in Amazon reviews, split into positive and negative mentions. Snapshot taken October 28, 2026.

Quality88% 👍

Assembly91% 👍

Lumbar support78% 👍

Build quality77% 👍

Adjustability63% 👍

Firmness48% 👍

Durability38% 👍

Back support60% 👍

Lumbar support is the reason people buy it, and 78% of 501 lumbar mentions are positive. The weak spots are the seat, which some say turns hard after a few hours (firmness is split 48% positive), and durability, where 62% of 221 mentions are negative, often about the armrests.

What owners say about the GABRYLLY Mesh High-Back

Topics mentioned most in Amazon reviews, split into positive and negative mentions. Snapshot taken October 28, 2026.

Quality92% 👍

Assembly97% 👍

Support77% 👍

Value for money83% 👍

Functionality82% 👍

Ergonomics79% 👍

Adjustability66% 👍

Stability27% 👍

A very well-liked build: 92% of 3,718 quality mentions and 97% of 1,839 assembly mentions are positive. The sore point is stability, where only 27% of 497 mentions are positive, and a third of adjustability mentions say the back support doesn't adjust enough.

FAQ

Does the GABRYLLY chair have lumbar support?

It has a curved mesh back that the listing calls lumbar support, but nothing you can adjust. GearLab's testers found no real lumbar support. If you need targeted lower-back pressure, the SIHOO M18's adjustable pad is the better fit.

What is the weight limit of each chair?

SIHOO rates the M18 for 330 lb. GABRYLLY's Amazon listing says 300 lb, but GearLab lists 280 lb for the same chair. Plan around the lower figure.

Which chair is better for tall people?

The GABRYLLY's seat rises to 23.6 inches and the brand recommends it for users from 5'2" to 6'1". Both have adjustable headrests, so neck support is close.

Do these chairs get uncomfortable after a few hours?

Some owners say so about the SIHOO M18: firmness mentions split almost evenly, with complaints that the seat feels hard late in the day. The GABRYLLY's mesh seat doesn't flatten the way foam does.

Ready to buy?

• Our pickSIHOO M184.3★ · 17,197 ratings
  Check price on Amazon
• GABRYLLY Mesh High-Back4.5★ · 14,333 ratings
  Check price on Amazon

Prices and stock change often, so the button shows today’s price on Amazon.com.

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How we put this together

We compared manufacturer specs and Amazon listing details, read the patterns in Amazon owner reviews (we refresh this snapshot regularly), and scored each product with our published rubric. We have not tested these units hands-on. When we do, the page will say so. Prices change constantly, so we link to the live price instead of quoting one.