ProtoArc EC300 Ergonomic Office Chair with Height Adjustable Backrest | High-Back Mesh Chair, Sliding Seat, 3D Headrest, 4 Recline Angles, Wider Armrests, for Home Office Long Hours Sitting, Black
Original price was: $269.99.$219.99Current price is: $219.99.
Price: $269.99 - $219.99
(as of Aug 16, 2026 05:21:46 UTC – Details)
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Product description
ProtoArc Ergonomic Office Chairs Series
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Price
$219.99$219.99
$229.99$229.99
$179.99$179.99
$299.00$299.00
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Recommended Height
5’4″ – 6’1″
5’4″ – 6’0″
5’4″ – 6’0″
5’1″ – 6’0″
5’1″ – 6’0″
Lumbar Support
Adjust Height-Entire Backrest
Adjustable Height & Depth
Adjustable Height & Depth
Fixed
Adjustable Height
Armrest Type
2D
4D
2D
2D
4D
Seat Depth Adjustment
✔
✔
✔
✔
✔
Headrest
3D Headrest
3D Headrest
3D Headrest
No Headrest
No Headrest
Seat Cushion
Foam
Mesh
Foam
Foam
Foam
Backrest
Split Back
Solid Back
Solid Back
Solid Back
Solid Back
Tilt & Tilt Lock
4 Positions
4 Positions
4 Positions
3 Positions
4 Positions
Tilt Tension
Adjustable (Rotary Knob)
Adjustable (Rotary Knob)
Adjustable (Rotary Knob)
Auto-Adaptive Recline
Adjustable (Hand Crank)
Casters
2.36″ Silent Casters
2.36″ Silent Casters
2.36″ Silent Casters
2.56″ Hair-Resistant Casters
2.56″ Hair-Resistant Casters
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. EC300 ergonomic chair
Enjoy Ergonomic Support with Eight Points of Adjustment
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. ProtoArc EC300 Adjustale Ergonomic Office Chair
High Back Office Chair with 8 Points of Adjustment – providing lasting comfort & support throughout your workday.
1 Adjustable Backrest
2 Lumbar Support
3 Foam Seat Cushion
4 Airflow Mesh
5 Wide Armrest
Elevate Your Workspace with the EC300 Versatile Ergonomic Desk Chair
Home Office – Work in Comfort
Transform your home workspace with EC300. Its adjustable lumbar support and 55D foam seat keep you focused. Perfect for remote professionals who value both health and productivity
Corporate Office – All-Day Support
Elevate your office seating with EC300’s 4-position recline and 3D headrest. Designed for 8+ hour shifts, it reduces back strain and boosts focus. Durable alloy base ensure professional reliability
Bedroom – Relax & Recharge
Unwind in your private space. The EC300 offers 130° recline and soft foam cushion for reading, or napping. Breathable mesh keeps you cool. A stylish addition to any cozy bedroom corner
Who is the EC300 designed for?
The EC300 is designed for users who spend long hours at their desk and need full-body ergonomic adjustability. Recommended for 5’4″ to 6’1″ height with a weight capacity of 220 lbs.
How does the height-adjustable backrest work?
The backrest adjusts through 5 height positions, aligning key support zones with your spine. Unlike EC200’s independent lumbar, the entire backrest moves to match your torso length for a more tailored fit.
What’s the difference between EC300 and EC200?
EC300’s entire backrest adjusts through 5 height positions to match your spine, while EC200 has independent lumbar adjustment only. EC300 also fits taller users up to 6’1″ with wider and stronger lumbar & sacrum support.
What are the recline positions and can I adjust the tension?
4 lockable recline positions: 90° (work), 105° (reading), 120° (lounging), 130° (resting). Tilt tension knob lets you customize reclining resistance – from light to firm, to your preference.
Is the headrest difficult to install?
No, we provide clear step‑by‑step instructions. If you still have questions, please reach out to us – we’re always ready to help.
Customizable Back Support: A 5-height backrest and targeted lumbar support help align key support zones with your spine, giving office users a more tailored fit through long desk sessions
Lower Back and Sacrum Support: The wider lumbar surface supports the lower back and sacrum area, helping promote a more natural seated posture during focused workdays
Sliding Seat Depth: A 5-position seat slider with 1.97″(50mm) adjustment helps match thigh support to different leg lengths, keeping your back in contact with the chair
Pressure-Distributing Cushion: 55 high-density foam evenly supports your hips and thighs, reducing pressure points while maintaining stability. Firm enough to prevent bottoming out – comfortable enough for all-day work
3D Adjustable Headrest: Up/down, forward/back, pillow rotation, and overall rotation let you fine-tune head and neck support for reading, typing, or leaning back
4-Position Recline: Lock the backrest at 90°, 105°, 120°, or 130° with adjustable tilt tension, so you can move from focused work to reading or short breaks
Stable Office Build: An alloy base, SGS Class-4 gas lift, and quiet-roll casters support smooth movement and steady daily use for users 5‘4″ to 6’1″, up to 220 lb
User Reviews
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