Name: ProtoArc Ergonomic Office Chair – EC200 High-Back Mesh Computer Chair with Lumbar Support, 3D Adjustable Headrest & Sliding Seat for 8+ Hour Comfor...
Brand: ProtoArc
SKU: B0F9WCGMQH
Price: 219 USD
Availability: InStock
Rating: 4.5 (170 reviews)

Our Verdict

ProtoArc EC200 Wins

ProtoArc Ergonomic Office Chair – EC200 High-Back Mesh Computer Chair with Lumbar Support, 3D Adjustable Headrest & Sliding Seat for 8+ Hour Comfort, Big & Tall Home Office Desk Chairs - Black

It offers a higher max weight capacity of 350 lbs and a seat height range of 16.0-20.5 inches. Choose SIHOO M57 for explicit lumbar height and depth adjustments and if 330 lbs capacity is sufficient.

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Spec Comparison

10 specs compared

Specification	ProtoArc Ergonomic Office Chair	SIHOO M57 Ergonomic Mesh
Price	$219	$240
Rating	4.5(170)	4.3(7.6k)
Max Weight	350 lbs	330 lbs
Height Range	16" - 20.5"	—
Lumbar	Yes	Yes
Material	mesh	Mesh
Weight	45 lbs	41.6 lbs
Model Number	EC200	—
Warranty	12 years	3 years
Armrests	4D	3D
Tilt	—	Yes
Headrest	—	Yes

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Pros & Cons

Quick overview of strengths and weaknesses

ProtoArc Ergonomic Office

Pros

12-year warranty
Highly adjustable
Breathable mesh
Supports up to 350 lbs

Cons

Premium price point
Steep learning curve for adjustments

SIHOO M57 Ergonomic

Pros

Lumbar support adjusts height and depth.
Supports users up to 330 lbs.
Reclines from 90 to 126 degrees.
3D adjustable armrests included.

Cons

Recline range is limited to 126 degrees.
Seat depth adjustment is not available.
No explicit mention of forward tilt.
May be oversized for smaller users.

Frequently Asked Questions

Common questions about this comparison

Which chair is better for heavier users?

The ProtoArc EC200 is better for heavier users, supporting up to 350 lbs compared to the SIHOO M57's 330 lbs. The ProtoArc also has a clear seat height range of 16.0-20.5 inches for optimal positioning.

What are the main differences in lumbar support?

Both chairs offer lumbar support. The SIHOO M57 explicitly states its lumbar support adjusts for both height and depth, providing precise customization. The ProtoArc EC200 also features lumbar adjustability for comfort, but without specific depth details.

How do the armrest adjustments compare?

The ProtoArc EC200 features 4D adjustable armrests, offering more extensive movement options (height, depth, width, pivot) for personalized comfort. The SIHOO M57 comes with 3D adjustable armrests, providing good customization for height, depth, and pivot.

Is the ProtoArc EC200's higher price worth it?

The ProtoArc EC200 justifies its premium price with a significantly longer 12-year warranty and a higher 350 lbs weight capacity. It also includes 4D armrests and a sliding seat for enhanced adjustability compared to the SIHOO M57's 3-year warranty.