Sihoo B300 Pro Chair Review: Affordable Ergonomic Comfort

I had the opportunity to review the Sihoo C300 Pro V2 a few months ago and it has become my permanent home office chair. Frankly, I never gave a damn about butt comfort during long hours of sitting before that, let alone reviewing elegantly constructed chairs. Fast forward to now, I think I’ve just become a full-fledged chair reviewer.

The B300 Pro is my second Sihoo chair. It’s a $289.99 ergonomic office chair with more ways to adjust its suspension than some motorcycles.

A quick look at its features list reveals things like 4D Micro-Fit lumbar support, six-dimensional armrests, an ultra-wide three-dimensional headrest, adjustable backrest height, adjustable seat depth, weight-adaptive recline, and more. But what does all this translate into in daily use?

After two weeks of testing (mostly from my wife, to be honest), here’s my breakdown.

The chair is officially designed for users between 1.55 and 1.85 m (5 ft 1 and 6 ft 1), giving it a wide target audience. Its backrest can be raised by 2.2 inches (56 mm), while the seat depth adjusts from 16.5 to 18.5 inches (419 to 470 mm).

Sihoo’s core design philosophy is that a chair should not lock you into a single fixed position because humans rarely spend eight hours sitting in the same position. You can sit upright while answering emails, lean forward while concentrating, slouch slightly while reading, lean back during a meeting, and move sideways when your body starts to mount a small rebellion after three hours.

The B300 Pro’s main feature is its 4D Micro-Fit lumbar support, a feature where the company is trying something much more sophisticated than simply placing a foam cushion behind your lower back. The lumbar mechanism adjusts vertically by about 2 inches (51 mm) and in depth by 0.8 inches (20 mm). Instead of remaining static, it actively maintains contact with your lower back as you change posture. It’s a simple premise, but remarkably useful in daily use.

Then there are the armrests. Sihoo calls them “6D Integral Armrests” – they swivel, slide, lift up and completely hide away when you need extra side space. Higher up, an ultra-wide 3D headrest supports the head and neck in multiple positions.

Both the seat and backrest use Sihoo’s FlexWeave mesh, which is designed to facilitate airflow while flexing with body movements. While this may seem like a minor detail, mesh is something you appreciate most when you don’t have it. Especially in the hot Delhi climate, it’s a welcome feature that I also love about the more expensive C300 Pro V2.

Perhaps the most intelligent mechanism is the weight-adapted recline. Instead of requiring you to manually adjust the recline tension each time you sit, the B300 Pro automatically adjusts the resistance based on your weight. The chair features three lockable recline positions: 105, 120, and 135 degrees, all of which feel secure and supportive, even for my nearly 200-pound (90 kg) frame.

Despite its emphasis on adjustability, the B300 Pro is not a fragile desk chair. US specifications list a net weight of 43.7 pounds (19.8 kg), a seat width of 19.1 inches (48.5 cm), and a maximum load capacity of 330 pounds (150 kg).

Totally transparent, my wife ended up spending many more hours in this chair than I did. I already use the C300 Pro V2 in my setup, and since the B300 Pro features a sliding footrest and folding armrests, it fit perfectly into his workflow.

She has been deeply impressed. Much of your desk work involves working with clay, which means the ability to move the armrests out of the way to allow unrestricted arm movement is a major plus. When you want to cross your legs and relax, the footrest is equally practical.

At $289.99 on the US Sihoo store at the time of writing, the B300 Pro occupies an interesting middle ground: eschewing cheap build quality without entering the four-figure price range of high-end ergonomic brands.

You can buy an office chair for much less or spend much more. The ergonomic seating market mirrors the motorcycle industry in that sense: There’s always another level of engineering available if you’re willing to spend several hundred dollars more.

Some people spend $20,000 on a motorcycle when a $5,000 scooter makes the same trip. Sometimes the goal is not simply to get from A to B, but to make the time spent getting there considerably more enjoyable. If you’re going to spend eight hours a day in one place, you might as well make it a comfortable one.

Product page: Sihoo

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