Introduction
This manual provides detailed instructions for the assembly, operation, and maintenance of your Marsail Ergonomic Office Chair. Designed for comfort and support during long hours of use, this chair features multiple adjustable components to suit individual preferences and promote proper posture. Please read this manual thoroughly before assembly and use to ensure safe and optimal performance.

Image: Marsail Ergonomic Office Chair (Grey, With Headrest)
Safety Information
For your safety and to prevent damage to the chair, please adhere to the following guidelines:
- Do not exceed the maximum weight capacity of 300 pounds (136 kg).
- Ensure the chair is properly assembled according to the instructions to maintain stability and safety.
- Regularly check all bolts and screws to ensure they are tightened. Loose components can lead to instability and potential injury.
- Avoid standing on the chair or using it as a step stool.
- Keep hands and fingers clear of moving parts during adjustment.
Product Features
The Marsail Ergonomic Office Chair is designed with several key features to enhance user comfort and support:
Fully Adjustable Design
This chair offers extensive customization to fit various body types and work postures. It includes an adjustable 2D headrest, a backrest with a 90° to 120° recline range, and 3D adjustable armrests.

Image: Overview of adjustable components including headrest, lumbar, and armrests.
Adaptable Lumbar Support
The computer chair's lumbar support system can be adjusted 1.18 inches (3 cm) forward and backward, and 2.16 inches (5.5 cm) up and down. This allows it to perfectly fit the curve of your lower back, protecting spinal health.

Image: Detailed view of the adaptable 2D lumbar support.
Supportive Mesh Backrest
The minimalist mesh backrest provides responsive support while promoting airflow, preventing heat and sweat buildup during prolonged use. All chair accessories have passed BIFMA and SGS tests, ensuring personal safety and durability.

Image: Breathable mesh backrest for cool and comfortable seating.
Comfortable Seat Cushion
The seat features 3.14 inches (8 cm) of thick, high-density foam, providing enhanced comfort for daily work. Its wider design offers a larger load-bearing area, reducing pressure on the buttocks.

Image: Thick and comfortable seat cushion.
Flexible PU-Padded Armrests
The smoothly rounded, PU-padded armrests can be moved forward or back (1.96 inches / 5 cm depth adjustment) and swiveled left or right (15° swivel) to find your optimal arm position. They also feature a 90° flip-up function, allowing you to easily slide the chair under a desk or gain more freedom of movement.

Image: Flexible PU-padded armrests with multiple adjustment options.
Product Specifications
| Specification | Detail |
|---|---|
| Brand | Marsail |
| Model Name | MSOC10G-US |
| Color | Grey |
| Product Dimensions (D x W x H) | 46.06"D x 23.62"W x 22.83"H (117cm D x 60cm W x 58cm H) |
| Maximum Weight Recommendation | 300 Pounds (136 kg) |
| Back Style | Mesh Back |
| Special Features | Adjustable Headrest, Adjustable Height, Adjustable Lumbar, Arm Rest, Ergonomic |
| Fill Material | Foam (for seat) |
| Included Components | Arm Pad, Caster |
| Item Weight | 30.4 pounds (13.8 kg) |
| UPC | 810158826540 |

Image: Product dimensions and maximum load capacity.
Setup and Assembly
The Marsail Ergonomic Office Chair is designed for straightforward assembly. All necessary tools and hardware are typically included in the packaging.
Before You Begin:
- Unpack all components and verify against the parts list (usually found in the included assembly guide).
- Lay out all parts on a clean, soft surface to prevent scratches.
- Ensure you have ample space for assembly.
- It is recommended to have a second person assist with certain steps for easier and safer assembly.
General Assembly Steps (Refer to included manual for detailed diagrams):
- Attach the casters to the chair base.
- Insert the gas lift cylinder into the center hole of the base.
- Attach the seat mechanism to the underside of the seat cushion.
- Connect the backrest to the seat assembly.
- Mount the assembled seat and backrest onto the gas lift cylinder.
- Attach the armrests to the seat.
- Install the headrest onto the backrest.
- Tighten all screws and bolts securely.

Image: Key components for assembly: base, casters, and gas lift.
Operating Instructions
Your Marsail Ergonomic Office Chair offers several adjustment options to customize your seating experience:
Chair Height Adjustment
Locate the lever on the right side, beneath the seat. Pull the lever upwards to raise the chair. To lower the chair, remain seated and pull the lever upwards. Release the lever at your desired height.
Backrest Recline and Tilt Lock
The backrest can recline from 90° to 120°. To recline, pull the lever on the left side, beneath the seat, outwards. Lean back to your desired angle and push the lever inwards to lock the position. To unlock and return to upright, pull the lever outwards and lean forward slightly.

Image: Recline and Tilt-Rock functionality.
Tilt Tension Adjustment
The round knob located beneath the seat, at the front, controls the tension of the tilt mechanism. Turn the knob clockwise to increase tension (making it harder to recline) or counter-clockwise to decrease tension (making it easier to recline).
Lumbar Support Adjustment
The lumbar support can be adjusted both vertically and in depth. Use the knobs or levers on the backrest to move the lumbar support up or down, and forward or backward, to align with the natural curve of your spine.
Headrest Adjustment
The 2D headrest can be adjusted for height and angle. Gently push or pull the headrest to move it up or down. Tilt it forward or backward to find the most comfortable position for neck and head support.

Image: 2D Headrest for optimized head and neck support.
Armrest Adjustment
The 3D armrests offer multiple adjustments:
- Height Adjustment: Press the button on the side of the armrest and move it up or down. Release the button to lock.
- Depth Adjustment: Slide the armrest pad forward or backward.
- Swivel Adjustment: Rotate the armrest pad left or right.
- Flip-Up Function: To move the armrests out of the way, lift them upwards until they click into a vertical position. To return them, pull them down.

Image: 90° Flip-Up Armrests for increased freedom and space.
Maintenance
Proper maintenance will extend the life and appearance of your Marsail Ergonomic Office Chair.
- Cleaning: The manufacturer recommends dry cleaning for the fabric components. For general cleaning, wipe surfaces with a soft, damp cloth. Avoid harsh chemicals or abrasive cleaners.
- Mesh Back: Gently vacuum the mesh backrest to remove dust and debris. For spills, blot immediately with a clean, dry cloth.
- Casters: Periodically clean the casters (wheels) to remove hair, dust, and debris that can impede smooth rolling.
- Hardware: Every few months, check all screws and bolts to ensure they are tight. Re-tighten if necessary to maintain stability.
- Avoid Direct Sunlight: Prolonged exposure to direct sunlight can cause fading and degradation of materials.
Troubleshooting
If you encounter issues with your Marsail Ergonomic Office Chair, consider the following common solutions:
- Chair Squeaks/Noises:
- Check and tighten all assembly bolts and screws.
- Apply a small amount of silicone lubricant to moving parts, such as the gas lift or tilt mechanism, if accessible.
- Chair Does Not Adjust Height:
- Ensure the height adjustment lever is fully engaged.
- Verify the gas lift cylinder is correctly installed and not damaged.
- Chair Wobbles/Unstable:
- Re-check all assembly connections, especially where the base connects to the seat and backrest.
- Ensure the chair is on a flat, even surface.
- Casters Not Rolling Smoothly:
- Remove any hair or debris wrapped around the caster wheels.
- Clean the casters with a damp cloth.
If these steps do not resolve the issue, please contact Marsail customer support for further assistance.
Warranty and Support
Marsail is committed to providing high-quality products. While specific warranty details are typically provided with your purchase documentation, general support is available for product inquiries and assistance.
- For detailed warranty information, please refer to the warranty card included in your product packaging or visit the official Marsail website.
- For customer support, technical assistance, or to inquire about replacement parts, please contact Marsail directly through their official channels.
- Protection plans may be available for extended coverage. Please check with your retailer for options such as 2-Year or 3-Year Protection Plans.
You can often find contact information on the Marsail Store on Amazon or their official company website.







