New Arrival → B300 Pro

Premium Pick → C300 Pro V2
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B300 Pro Ergonomic Office Chair

4.4
Rated 4.4 out of 5 stars
31 Reviews
$259.99 $329.99
Color: Black
Version

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Details

Sihoo B300 Pro delivers precision ergonomic support with personalized comfort for users from 5'1" to 6'1".

Featuring 4D Micro-Fit Lumbar Support, 6D all-around armrests, a 3D ultra-wide headrest, and a weight-adaptive mechanism, it lets you fine-tune your sitting experience for a comfortable, supportive fit throughout the day.

Free Shipping | 3-Year Free Warranty | 30-Day Free Return | Available in U.S. and Canada for now

Sihoo B300 Pro

Precision Support.
Every Body.

Highlights at a Glance

4D MicroFit Lumbar Support

Precision Support. Right Where You Need It.

Moves with your back for support that feels just right. Adjust 0.8" in depth and 2" in height, with subtle movement that follows you as you sit, lean, or recline.
Upright

Upright

Keeps your spine in its natural S-curve.
Working

Working

Stay supported through every task.
Moving

Moving

Full lumbar support through every twist and turn.
Recline

Recline

Lean back. Stay supported.
Adjustable Contour-Aligned Backrest

Your Back. Your Fit.

Shaped to follow your spine for natural, full-back support. Adjust the height by 2.2" to find your perfect fit.
Made to fit. 2.2" of height adjustment.
Full-back support. Top to bottom.
6D All-Around Armrests

Made to Move With You.

Rotate. Adjust. Flip up. Recline. Support that follows wherever you go.
Work

Work

Total arm support for relaxed, productive work.
Recline

Recline

Full-body relaxation, arms included.
Move

Move

Unrestricted movement, on demand.
Any Position

Any Position

Arm support, in every position.

Flip Up. Tuck Away.

More room when you need it.
3D Ultra-Wide Headrest

More Room to Relax.

Wide, adjustable support for your head and neck—whether you're sitting upright, leaning back, or resting to the side.
Spacious design for all-day comfort.
Adjust easily. Align perfectly.
Weight-Adaptive Recline

Just Lean Back.

Automatically adjusts recline resistance to your weight. No knobs. No setup. Just smooth, effortless recline.
Smooth, effortless recline.
Stable recline. Easy return.
105° / 120° / 135° Recline

Work. Create. Unwind.

Three lockable recline angles for focus, creativity, and relaxation.

Adjust Without Reaching.

Height. Depth. Recline. All right at your fingertips.
FlexWeave™ Mesh

Cool. Soft. Supportive.

Breathable mesh keeps air flowing while flexing with your body for lasting comfort and support.
CERTIFIED DURABILITY

Built to Last. Certified to Perform.

Tested to meet rigorous BIFMA standards for strength, durability, and everyday performance. Built for years of work, rest, and everything in between.

Made for Your Space

Deep Focus

Game On

Cozy Work

Creative Flow

Enlarged view

Why Upgrade to B300 Pro?

NEW! B300 PRO B300 PRO
B100 PRO B100 PRO
Armrests
6D All-Around Armrests
4D 360° rotation
Lumbar Support
4D Micro-Fit Lumbar
Composite sacral pillow
Headrest
3D Ultra-Wide Headrest
Wide 3D Headrest
Backrest
Adjustable Contour-Aligned Backrest. Adjusts 2.2" to fit users from 5'1" to 6'1".
Fixed
Seat Depth Adjustment
approximately 2 inches
×

Tech Specs

4.4
Rated 4.4 out of 5 stars
Based on 31 reviews
84%would recommend this product
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31 reviews
  • EW
    Emily W.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    August 14, 2026
    5 Stars

    This chair is very comfortable to sit in, and you will not get tired easily even after sitting for a long time.

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  • ST
    Scarlett T.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    August 2, 2026
    5 Stars

    I ordered this ergonomic chair for my nephew to replace his old seat and install a real comfortable office area in his room to do his homework or play on the computer.

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  • RR
    Ruby R.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    July 31, 2026
    5 Stars

    A deserved 5/5. This B300 Pro model with footrest is a very complete option to combine a rigorous working posture during the day and a relaxed position for breaks. Solid, well thought-out to assemble and very modular, it fulfills its role perfectly.

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  • KR
    Karson R.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    July 28, 2026
    5 Stars

    The lumbar support is appreciable and can be adjusted in height and depth. The height of the seat and its inclination are managed via well-thought-out joysticks. The headrest can also be adjusted in height and angle. The armrests can be raised and swivelled to adapt to different body types.

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  • EP
    Ella P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    July 25, 2026
    5 Stars

    I am really satisfied with this SIHOO B300 Pro armchair. Assembly is simple, the materials are of very good quality and the finishes are meticulous.

    The lumbar support fits the back perfectly and the mesh backrest is very breathable, which is pleasant even after several hours of work. The headrest and armrests are easy to adjust, allowing you to find a comfortable position. The reclining mechanism is fluid and the leg rest is a real plus for taking a break.

    It is perfectly compatible with all body types. The chair is stable, quiet and the wheels glide perfectly on the floor. Comfort is there for daily use, whether for teleworking or gaming. I would definitely recommend this chair to anyone looking for a high-end ergonomic seat that offers excellent value for money.

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