The Sihoo M90D is an affordable ergonomic office chair that will suit a wide range of potential body types, with a relatively wide-seat, breathable materials, a solid foundation of five brushed aluminum legs, and a maximum weight rating of 330lbs (149 kg). It’s also easy to construct (though easier with a second pair of hands) and looks fairly smart.
Is the Sihoo M90D perfect for your next office chair?
Sihoo M90D Specs and Style
The M90D is an ergonomic office chair. You can tell this from the packaging it arrives in, which features a series of instructions on how to use the office chair to best fix the back problems you’re carrying from your old chair. Yes, I’m talking to myself here, which is why I’m optimistic about the M90D’s proposed sitting angle, which is effectively upright without slouching. Who knew correcting years of slumping could be so simple?
Facetious comments aside, the M90D comes with an ergonomic design with integrated lumbar support, adjustable height, adjustable arms, and a headrest that is also adjustable but might need some direct force to get moving once in place. Once the headrest moves once or twice, though, it’s easy to move up and down the notches as you desire.
The build quality appears good. The seat itself is covered in breathable mesh material that should help keep you cool and fresh during the warmer months, while the backrest uses a different type of mesh. Both are comfortable, and sitting in the M90D won’t tire you out unduly. The metal legs feel strong and durable, and while the casters do have a plastic element, they also feel strong enough to last.
In terms of overall style, the Sihoo M90D is decent. It’s unlikely to win any groundbreaking design awards, but the positioning of the lumbar is good, at least for me, and the armrests are positioned far enough apart that my arms rest comfortably when desired. The backrest mesh has some sort of pattern on it, the design of which I cannot really discern, but it does offer something different from a plain mesh backrest.
Constructing the Sihoo M90D
The Sihoo M90D arrives in a large box, as you’d expect, containing all the various pieces of the chair construction puzzle. I say puzzle; that really does the ease of the process a disservice. As alluded to in the introduction, the M90D construction process is easier with a second set of hands. There are one or two moments, such as screwing the base and backrest together, that are a much simpler task with a willing assistant. That said, with the assistance of a wall, table, or otherwise, the M90D is definitely possible to construct solo.
First up, unpack the Sihoo M90D box and look for your protective white gloves, a key part of any chair construction. Why these gloves are included is beyond me, but I guess they’re to protect your fingers against pinching, dirt and grime, and other office chair construction-related injuries, and they certainly gave my family a good chuckle, saying I looked like a mime that had lost his way and was now building office chairs.
Unpack the Base, Attach the Wheels
Back to the actual task at hand. As with any construction of this nature, starting with a check that everything has safely made the journey to you and is in working capacity is important. You don’t want to get most of the way through and realize you’re missing a key component.
Start by unpacking the metal base and inserting the casters into each leg, followed by the gas cylinder into the center hole. The Sihoo instruction manual advises that once the gas cylinder is in place and the main seat component is attached, it’s difficult to separate the two, so make sure you’re absolutely ready to do so when the time comes.
Attach the Arm Rests & Lever Mechanism
Next up, you’ll want the seat cushion and the armrests. On the underside of the seat, you’ll spot where the armrests attach to the base, with each armrest requiring three bolts (two of one length, one of another). These are easy enough to attach; just make sure you figure out which way around the armrests are meant to face—there is a handy arrow showing you the direction you’ll face when you sit down to guide your judgment.
While you have the seat upside after attaching the armrests, attach the level mechanism. You’ll need four bolts of equal length, all of which are included in the box (plus some handy extras!). Screw them into place, making sure the level mechanism is the right way around (you want the large knob at the front and the backrest attachment plate at the rear).
Attach the Backrest, Place on Gas Cylinder
Now, if you’re building the Sihoo M90D solo, you’ll want to prop the seat on the armrests, leaning towards the floor. You need to use three bolts to attach the backrest to the underside of the seat. It’s not that difficult, and the bolts slide into place with relative ease. Once in place, make sure to tighten them up, as you don’t want the backrest to fall off the first time you lean back into the chair.
Now, flip the chair over. Make sure the base is nearby, then lift the constructed seat cushion and backrest onto the gas cylinder, and you’re almost done!
Last, insert the headrest into the slot at the top of the backrest, and you’re good to go.
Is the Sihoo M90D Comfortable?
The Sihoo M90D is touted as an ergonomic office chair, and it fits the bill for the most part. You don’t get heaps of adjustable features, but the bits you can move allow you to adjust the M90D to your liking. For reference, I’m around 5'7" and weigh roughly 180lbs, and found the chair comfortably for long periods, using M90D as my daily sitting device for several weeks. Sihoo advises that the M90D is suitable for those between 5'5" and 6'2".
The adjustable backrest will definitely come into play for those with larger frames. You can move the backrest up between three notches before it slides back into its starting position. You can play around with these to find a comfortable position for the integrated lumbar support and similarly move the headrest up and down until you find a comfortable setting.
I’d like the seat cushion to feel a little more cushiony and a little less office-mesh, but in fairness, that’s what will keep the M90D feeling cool in warm weather and probably fresher for longer for those of us that spend eight hours per day in the same seat.
In short, if you want that next level of comfort, you’ll have to shell out a little more, but the Sihoo M90D does a great job overall.
Should You Buy the Sihoo M90D?
The Sihoo M90D retails for $359, which for an ergonomic office chair with a few adjustable features and a good level of comfort is fairly reasonable. The M90D also comes with a three-year warranty, which is worth noting.
If you’re in the market for a new ergonomic office chair, give the Sihoo M90D a try. It’s a great option for those that want some extra comfort and an office chair that will encourage you to correct your posture without breaking the bank.
