Does the chair have an installation manual?

Dear customers, Hello, please check our video installation guide. If you have any questions in the future, please contact us through the Amazon information window. Luckyear after-sales team service

Do the arm rest adjust up and down or do they just flip?

It is 4D Flip-up Armrest, that can be adjusted up and down, left and right, but left and right can face 40° outward or inward

What materials are used in this chair?

Answer in the product description.

How do you get this chair to rocking function?

You can recline by pulling the adjustment lever outward. Please see the operation video. (PS: The chair does not have a button to lock the back tilt function)

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Office Chair Ergonomic Desk Chair-400lbs Big and Tall Heavy Duty, Wide & Soft 3D Modeling Foam Cushion Home Office Desk Chair with Adjustable Seat Height, Executive Computer Task Chair

Office Chair Ergonomic Desk Chair-400lbs Big and Tall Heavy Duty, Wide & Soft 3D Modeling Foam Cushion Home Office Desk Chair with Adjustable Seat Height, Executive Computer Task Chair

Product ID: 510079670

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Details

Brand
Luckyear
Color
Black
Product Dimensions
20.7"D x x
Size
3'6" x 1'8" x
Back Style
mesh back

💪400 lbs heavy-duty support

🪑21-inch wide 3D molded foam cushion

🌬️Breathable mesh back for airflow

Description

🖥️ Elevate your workspace comfort — because your hustle deserves the best seat in the house!

BUILT TO ENDURE - Supports up to 400 lbs with a BIFMA-certified heavy-duty base for unmatched durability.
CLOUD LIKE COMFORT - Generous 21-inch wide, 5.2-inch thick 3D molded foam cushion designed for all-day hip support.
CUSTOMIZABLE ERGONOMICS - Adjustable seat height and lumbar support tailored to your unique posture needs for peak productivity.
STAY COOL STAY FOCUSED - Premium breathable PE polyester mesh back promotes airflow to keep you comfortable during marathon work sessions.
EFFORTLESS SETUP SUPPORT - Quick 15-20 minute assembly with clear instructions plus responsive 24-hour customer service to keep you moving.

The Luckyear Heavy Duty Office Chair combines robust 400 lbs weight capacity with a wide, ergonomically molded 3D foam cushion and breathable mesh back. Designed for professionals who demand comfort and durability, it features adjustable height and lumbar support, a BIFMA-certified base, and quick assembly. Perfect for long hours at the desk, this chair keeps you cool, supported, and productive.

Specifications

Brand	Luckyear
Color	Black
Product Dimensions	20.7"D x 24.62"W x 44.3"H
Size	3'6" x 1'8" x 2'2.62"
Back Style	mesh back
Special Feature	Adjustable Height, Adjustable Lumbar, Ergonomic
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Recommended Uses For Product	Gaming, Office, Reading
Maximum Weight Recommendation	400 Pounds
Style	Modern
Pattern	Solid
Room Type	Office, Office Reception, Study Room
Age Range (Description)	Adult
Included Components	High elastic nylon mesh backrest, PU Arm Pad, Smooth Caster, Soft Sponge Molded Cushion
Theme	Task Chair, Teacher Office Chair, business office, gaming Chair
Shape	L-Shaped
Model Name	Heavy Duty Office Chair
Arm Style	15° Left & Right Rolled, Flip-up Arms
Cartoon Character	black
Surface Recommendation	Hard Floor
Furniture base movement	Swivel
Indoor/Outdoor Usage	Indoor
Seat Height	17.6 Inches
Seat Depth	20.7 inches
Fill Material	3D Molded Foam Cushion
Seat Length	20.3 Inches
Leg Style	Tapered Leg
Arm Height	8 Inches
Reclining Position Count	2
Tilting	Yes
Is Customizable	No
Is Foldable	No
Chair Backrest Width	20.67 Inches
UPC	768443479219
Form Factor	office chair
Manufacturer	Luckyear
Item Weight	38 pounds
Item model number	home-office-desk-chairs