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Sihoo B100 Pro Ergonomic Office Chair With Flip-Up Armrest

4.9
Rated 4.9 out of 5 stars
56 Reviews
Regular price $259.99
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Color: White
Version

Benefits

  • Lower-Back & Sacral Support That Starts Lower
  • Upgraded Floating Sacral Cushion Design
  • Breathable Pressure-Relief Mesh
    Waterfall Seat for Better Leg Support
  • 3 Recline Positions up to 135°
  • Wide 3D Adjustable Headrest
  • 4D Flip-Up Armrests
  • Class 4 Gas Lift & Everyday Reliability
  • 3-year free warranty

Promises

  • 30-Day Free Returns.: Try the chair for 30 days. If it’s not for you, feel free to return it.
  • 3-Year Warranty: Enjoy lasting comfort and peace of mind with our 3-year warranty.
  • Free Shipping: Receive your chair in just 5-7 days, in US and CA.
  • Satisfaction Guarantee: For any issues, contact support_us@sihoo.com for prompt assistance and guaranteed satisfaction.

Payment methods

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How to choose a right ergonomic office chair?

Check out our buying guide for you!

Sihoo B100 Pro Ergonomic Office Chair

Sit Right Starts Here

Key Features

Support That Starts Lower — So You Sit Better

B100 Pro is designed to support both your lower back and the area below it, helping your pelvis stay more stable and your posture feel more naturally aligned throughout the day.

Arm Support That Adapts — Then Tucks Away

  • 4D Arm Support That Moves With You

    The enlarged armrests adjust in multiple directions for better elbow and forearm support while you work, create, or relax. And when you need extra room, they flip up neatly out of the way.

  • Flip Up. Slide In. Save Space.

    When you’re done, the armrests flip up so the chair fits more easily under your desk—ideal for smaller workspaces, shared rooms, or flexible home setups.

Ultra-Wide, 3D-Adjustable, Extra Comfortable

A Wider Headrest That’s Easier to Get Right

The 3D-adjustable headrest gives you more room to find the right fit for your neck and head—whether you’re sitting upright, leaning back, or shifting positions throughout the day.

Support from Neck to Thighs

From the headrest to the seat, B100 Pro is designed to support the parts of your body that take the most strain during long hours of sitting—helping you stay more balanced and less tense over time.

Lean Back and Reset

Recline up to 135° when it’s time to take a break, stretch out, or shift positions. It’s a simple way to reduce stiffness and avoid staying locked in one posture all day.

3 Recline Angles All Sitting Positions

From focused work to relaxed breaks 3 recline positions let you find the perfect angle for every moment.

Breathable Mesh That Holds Up

The performance mesh is breathable, supportive, and built for everyday use—helping you stay cooler through long sessions while maintaining steady support over time.

Sit Right, Think Better

Sit Right, Think Better

Sit Right, Think Better

Specifications

  • Overview

    Designed to help you sit right from the start, the Sihoo B100 Pro brings practical ergonomic support into everyday work, study, and home use. With responsive lower-back support, breathable mesh, and flexible adjustability, it’s built to support better posture without overcomplicating your setup.

    Name: B100 Pro Ergonomic Chair

    General Dimensions: 27.6"W x 28.3"D x 44.1"-51.6"H

    Product Weight: 36.4 lbs

    Assembly: Requires assembly

    Materials: Mesh, Plastic, Steel

    Maximum Load: 330 lbs

    Warranty: (3) years warranty

4.9
Rated 4.9 out of 5 stars
Based on 56 reviews
Total 5 star reviews: 52 Total 4 star reviews: 2 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 0
96%would recommend this product
Slide 1 selected
56 reviews
  • AO
    Alice O.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    April 15, 2026
    5 Stars

    Overall I am very satisfied. There are no complaints about the quality of the product itself, it is comfortable to sit on, and I think the cost performance is high. There's just one thing I'm worried about, but as other reviews have pointed out, it took quite a while to assemble. If the design is improved so that it can be assembled a little easier, I think it will be an even better product.

  • AF
    Adrian F.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    April 7, 2026
    5 Stars

    It is a very comfortable office chair, ideal for people who spend the majority of their time in front of the screen Positive

    points:

    The comfort is exceptional thanks to the material that allows body heat and air to circulate

    The lumbar support and the adjustable headrest are perfect for long periods of time in front of the screen

    The lifting armrests are very useful for storing the chair under the desk and there is even the possibility of rotating them for more comfort (not bad for The gaming)

    The chair is reclining on three angles and therefore adapts well to the user's preference The wheels

    are very quiet

    Points to review:

    the assembly is quite long (about 45mins) and a bit less intuitive than on other chairs that I have mounted. The step of assembling the lumbar support to the backrest was a bit more difficult than the rest because it was necessary to force the interlocking and the installation of the screws was not as easy

    One of the parts was a bit damaged and I think that someone must have already tried to assemble it. It is a small detail certainly but for something new we should not see this

    The instructions are only partially translated into French. The rest is in English or German. The assembly instructions are all graphic so it's good

    Overall this chair is an excellent product with a very good quality/price ratio and offers comfort that is difficult to match.

    The assembly is a bit long but I think it is normal given all the adjustments offered to the user as…

  • AO
    Adam O.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    April 6, 2026
    5 Stars

    A chair that stands out from the start for its modern and elegant design, the white color has fit perfectly with my work space.

    The assembly is simple and comes with everything you need, something that is appreciated because in a few minutes you have it ready to use without complications. Once assembled, you can tell that it is a chair designed for comfort, the adaptive lumbar support helps to maintain good posture and the set is very comfortable even after about 4 continuous hours.

    Another strong point is its fully breathable mesh material, which in addition to being resistant, prevents heat accumulation, ideal for prolonged use. The folding armrests are a great success, since they allow greater versatility, both to store it under the desk and to adapt it to different positions. It is so robust that it weighs compared to other chairs, which for now gives it quality and value in its use. Despite their weight, the mechanisms are practically silent.

    Highlights: Elegant and modern design, Easy assembly with everything included, breathable, resistant and comfortable mesh, ergonomic lumbar support, very practical folding armrests.

    In short, a very complete, comfortable and functional chair, perfect for those looking for ergonomics and good design in their work space. Highly recommended.

  • J
    JazzBlock
    Verified Buyer
    Rated 3 out of 5 stars
    March 27, 2026
    3 Stars

    The instructions are hard to understand, and I use my head.

    And since each part is so heavy, it's not impossible for women alone to make them, but they struggle.

    SIHOO chairs are very comfortable to sit on.

    This chair has armrests that slide back and forth and can be rotated. Even the armrests are very cushioned.

    You can also stretch your legs, but footrests don't have cushioning like armrests, so that's a bit disappointing.

    There is no functional problem, but the screw on the part where the headrest is attached is only on the right side, so no matter what you do, you can't stop it. Even if the right one doesn't stop, it doesn't wobble, so you can use it, but it's a bit disappointing.

    If that doesn't bother you, I recommend it because it feels good to the touch.

  • N
    NightShift
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    March 22, 2026
    5 Stars

    The SIHOO B100 PRO is a powerful weapon for fighting long hours of desk work. Equipped with independent lumbar support and 4D armrests, this is the definitive high-performance ergonomic chair that fits the body shape and posture of the seated person.

    Good point what you feel the

    moment you sit down is a light sitting comfort as if you have been freed from gravity. The independent lumbar support accurately holds the area from the sacrum to the lower back and naturally maintains the S-shaped curve of the spine, so there is a sense of stability that does not cause body pain even when sitting for a long time. Thanks to the 150% wide headrest and 4D armrests that move freely, it is wonderful to always be able to find the right position for yourself, from work to relaxation time. The highly elastic mesh material also has excellent breathability, so you can stay comfortable all year round without worrying about getting stuffy.

    What bothers me is that since it is

    multifunctional and has many adjustments, the number of parts at the time of assembly is very large, and I want to be prepared that it will take a reasonable amount of time and patience until completion. There are tools and work gloves included, but when working alone, the correct answer is to secure enough space to take on the challenge. However, beyond those hardships, a superb concentration environment that can never be enjoyed with cheap chairs on the market awaits. Once you know this comfort, it's a monopod that…