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 - Ergonomics
64

ProtoArc

EC200 High-Back Mesh

4.5
$219
Check Price
VS
SIHOO M57 Ergonomic Mesh Office Chair, High Back Home Desk Chair with 3D Armrests, Lumbar Support and Adjustable Headrest, Comfortable Computer Chair, Big & Tall Office Chair Hold 330 LBS-Black Black Modern - Ergonomics
61

SIHOO

M57 Mesh High

4.3
$240
Check Price

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 - Ergonomics

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.

$219Buy on Amazon

Bottom Line: ProtoArc EC200 is the better choice. It offers a higher max weight capacity of 350 lbs and a seat height range of 16.

Key Differences

The most significant spec differences at a glance

350

Max Weight Capacity Lbs

6% more
330
12

Warranty

300% more
3
45

Weight

8% more
41.6

Advantages

Where each product 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 - Ergonomics

ProtoArc

  • Max Weight Capacity Lbs: 6% higher (350.0 vs 330.0)
  • Warranty: 300% higher (12 vs 3.0)
SIHOO M57 Ergonomic Mesh Office Chair, High Back Home Desk Chair with 3D Armrests, Lumbar Support and Adjustable Headrest, Comfortable Computer Chair, Big & Tall Office Chair Hold 330 LBS-Black Black Modern - Ergonomics

SIHOO

  • Weight: 8% lower (45.0 vs 41.6)

Who Should Buy Which?

Find the right product for your needs

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 - Ergonomics

Buy ProtoArc if...

ProtoArc Ergonomic Office Chair

The ProtoArc EC200 is ideal for individuals prioritizing long-term comfort, durability, and extensive adjustability, especially those seeking maximum value. If you are a big and tall user needing a high weight capacity of up to 350 lbs, and you value a substantial long-term investment, the 12-year warranty makes this chair a standout. Its 4D armrests, 3D adjustable headrest, and sliding seat cater to users who spend 8+ hours at their desk and require precise ergonomic customization without a premium price tag.

SIHOO M57 Ergonomic Mesh Office Chair, High Back Home Desk Chair with 3D Armrests, Lumbar Support and Adjustable Headrest, Comfortable Computer Chair, Big & Tall Office Chair Hold 330 LBS-Black Black Modern - Ergonomics

Buy SIHOO if...

SIHOO M57 Ergonomic Mesh

The SIHOO M57 is best suited for users who prioritize advanced lumbar support adjustability and a sturdy, certified design, and don't mind a slightly higher price. If precise lumbar support that adjusts both height and depth is crucial for your back health and you fit comfortably within the 330 lbs weight capacity, this chair excels. It's also a strong choice for those who appreciate BIFMA and SGS certifications for quality assurance, even with a shorter 3-year warranty and a more limited recline range.

Spec Comparison

10 specs compared

Specification
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 - Ergonomics
ProtoArc Ergonomic Office Chair
SIHOO M57 Ergonomic Mesh Office Chair, High Back Home Desk Chair with 3D Armrests, Lumbar Support and Adjustable Headrest, Comfortable Computer Chair, Big & Tall Office Chair Hold 330 LBS-Black Black Modern - Ergonomics
SIHOO M57 Ergonomic Mesh
Price$219$240
Rating4.5(170)4.3(7.6k)
Max Weight350 lbs330 lbs
Height Range16" - 20.5"—
LumbarYesYes
MaterialmeshMesh
Weight45 lbs41.6 lbs
Model NumberEC200—
Warranty12 years3 years
Armrests4D3D
Tilt—Yes
Headrest—Yes

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Pros & Cons

Quick overview of strengths and weaknesses

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

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 Mesh Office Chair, High Back Home Desk Chair with 3D Armrests, Lumbar Support and Adjustable Headrest, Comfortable Computer Chair, Big & Tall Office Chair Hold 330 LBS-Black Black Modern

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.

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