If you want an Silla de oficina ergonómica de malla that gives you real lower back support without the flagship price tag, the SIHOO M90 is worth a look. It is built for home offices, study desks, and light gaming, and it fits people roughly 150 to 190 cm tall who want adaptive lumbar support on a budget. If you need adjustable seat depth, an extended warranty, or a higher weight rating, we list models below that fit those needs better, including the Doro C300 with adjustable seat depth and a five year warranty, and the M57 rated at 150 kg. The specifications below are the production specs for the chair.
SIHOO M90 at a Glance
| Spec | Detail |
|---|---|
| Product type | Ergonomic mesh office chair, high back with headrest |
| Max user weight | 136 kg (300 lb) |
| Lumbar support | Adaptive elastic lumbar, nylon and fibre spring |
| Backrest | Split upper and lower, 3 position height (6 cm) |
| Armrests | 3D, linked to the backrest, 5 height stops |
| Headrest | Height and angle adjustable, double joint (5 cm up, 22 degree tilt) |
| Recline | Three locked positions (110°, 116°, 130°) |
| Base | 5 point aluminium alloy, 1136 kg static test |
| Certificaciones | BIFMA and SGS (gas lift and mechanism) |
| Warranty | 3 years (Doro series: 5 years) |
| Seat height | 46 to 55 cm, adjustable on the gas lift |
| Seat depth | 46 cm, fixed (does not adjust) |
| Net weight | 21.2 kg |
The Split Backrest: The M90’s Signature
Most chairs at this price ship one rigid back panel. The M90 splits the back into an upper and lower section, laid out on a golden ratio, with a back frame shaped like a cow’s head on a three point, one piece structure. The lower section is meant to follow your lumbar curve while the upper section holds your mid and upper back.
Because the two halves move somewhat independently, the chair wraps the small of your back instead of pushing one flat panel into it. Over a long sit that shows up as less pressure building at the belt line. You normally only get this kind of split on chairs that cost a lot more, which is the main reason the M90 feels like better value than its price suggests.
Adaptive Lumbar Support That Tracks Your Posture
The lower back section sits on a nylon and fibre spring. Rather than a fixed bulge, it pushes back with a force that shifts as your weight and recline angle shift. Lean forward to type and it eases off; recline and it keeps contact. You can also raise or lower the whole backrest by about 6 cm across three gears, sliding the lumbar zone up or down to meet your height.
This is the part owners bring up first, and it is why we rate the M90 highly for all day sitting. A static lumbar pad can feel right for ten minutes and wrong after an hour. The spring loaded version tracks you as your posture moves through the day.
Armrests, Headrest, and Recline
El SIHOO M90 ships with 3D armrests that link to the backrest. When you recline, the armrests travel with you instead of staying put, so your forearms stay supported in more positions. The pads slide front to back and pivot left to right, with five height stops.
The headrest is a double joint design. It lifts up to 5 cm and tilts up and down by 22 degrees at both joints, so you can tuck it behind your neck or lift it clear. The backrest locks at three stops, 110°, 116°, and 130°, which covers upright work through a relaxed break.
Build Quality and What the Certifications Mean
A cheap chair is only a deal if it stays in one piece. The M90 uses a mechanical steel multi function mechanism and a five point aluminium alloy base. The base passed a 1136 kg static pressure test, and the gas lift and mechanism carry BIFMA and SGS certification. BIFMA is the US commercial furniture safety standard that procurement teams check before approving bulk seating, so the certification matters as much for resellers as for home buyers.
The materials are practical rather than plush. The seat and back use a breathable PE polyester mesh with a dragon pattern weave that keeps air moving, and the footrest variant swaps in a Textilene fabric. None of it is leather or padded foam, which keeps the chair light and cool but means it will not feel plush.
Dimensions and Who the M90 Fits
The M90 fits a clear body range. It is built for users 150 to 190 cm tall. The seat HEIGHT moves on the gas lift from 46 to 55 cm, so you raise or lower the whole chair to match your desk. The seat is 51 cm wide, and the overall chair height runs 107 to 130 cm. The published net weight is 21.2 kg.
Two measurements are easy to mix up, so here is the plain version. The seat HEIGHT adjusts, that is the gas lift raising or lowering the seat. The seat DEPTH, the front to back length of the pan, is fixed at 46 cm and does not move. If your thighs are short or long, a fixed 46 cm pan is either generous or tight, and you cannot change it. The height range tops out near 190 cm on paper, but the footrest version is sized for users up to 188 cm. Taller users should look at the Doro C300, which offers adjustable seat depth and a higher back. The M90 is built for the average adult desk worker.
Variants: Mesh, Sponge, Footrest, and Color
The M90 ships in a few forms so you can match it to the buyer.
- M90 standard: full mesh seat and back, the base model.
- M90D: same chair with a soft sponge cushion in place of the mesh seat, for buyers who prefer a padded pan.
- M90 with footrest: adds a retractable leg rest that slides out from under the seat for reclined breaks.
- Colors: grey frame with grey mesh, or black frame with black mesh.
- Base option: most markets get an aluminium base; the China budget version pairs a nylon base with the lift back.
One platform, several finishes, means a reseller can stock the mesh version for warm climates and the sponge version for buyers who dislike mesh, without carrying two separate chair families. That is the practical upside of the variant range.
Price and Value
Prices vary by region; the figures below are representative sale prices. In Australia the M90 starts around AUD 339, down from AUD 529, and the footrest version around AUD 419. In Europe the M90D lists about EUR 189.99 against a EUR 329.99 regular price. On Chinese retail the chair sits near CNY 649 to 849 with tens of thousands of reviews and a 95 to 98 percent positive rate.
Next to it sits the SIHOO M57, which carries a 150 kg rating and a similar price but uses a single piece mesh back with manually adjusted dual lumbar rather than the split adaptive design. Note the M57 is rated a bit higher (150 kg) than the M90’s 136 kg, but the M90’s split adaptive lumbar is the more advanced system. If your priority is the smartest lumbar support for the money, the M90 wins. If you want the widest color range for a branded rollout, the M57 has the edge.
Pros and Considerations
Pros
- Split backrest with adaptive, spring loaded lumbar at a budget price
- 3D armrests that move with the recline
- Double joint headrest with real height and tilt range
- BIFMA and SGS certified, aluminium base tested to 1136 kg
- Strong review record, especially in China
Considerations
- Fixed 46 cm seat depth, so match it to the user’s leg length; the Doro C300 offers adjustable depth if that matters
- Height range up to 188 to 190 cm; taller users can look at the Doro C300
- Three year warranty on the M90; the Doro line carries five years for buyers who want longer cover
SIHOO M90 vs M57 vs Doro C300
| Model | Lumbar | Seat depth | Max load | Warranty | Price band |
|---|---|---|---|---|---|
| M90 | Adaptive split | Fixed 46 cm | 136 kg | 3 yr | Budget |
| M57 | Dual, manual | Fixed | 150 kg | 3 yr | Budget |
| Doro C300 | Dynamic, adaptive | Adjustable | 136 kg | 5 yr | Mid |
El Doro S300 sits above all three as the flagship with anti gravity recline, but its price reflects that. For most buyers the choice is M90 versus M57, and the M90 takes it on lumbar technology. The adaptive lumbar support chair with adjustable seat depth and a five year warranty is the Doro C300, worth a look if you need those.
Buying the M90 for a Team or for Resale
The M90 also works as a volume model. On the wholesale program there is no minimum order for in stock chairs, and custom orders start at 50 units per SKU with a 20 to 25 day build window against 3 to 7 days for stock. The program supports distributors and private label partners with product images and videos, and the M90’s price and proven review base make it an easy chair to lead a budget range with. Buyers who want a longer warranty can pair it with the five year covered Doro line. See the SIHOO M90 wholesale page for the current quote and stock status.
FAQ
Is the SIHOO M90 worth it for back pain? It will not cure back pain, but the adaptive lumbar and split backrest reduce pressure during long sits better than a flat panel. Pair it with regular movement.
What is the maximum weight for the M90? The spec sheet rates the M90 at 136 kg (300 lb).
Does the M90 have adjustable seat depth? No. The seat depth, the front to back length of the pan, is fixed at 46 cm. The seat HEIGHT does adjust, from 46 to 55 cm on the gas lift, which is standard for an office chair.
How long does assembly take? One person can assemble it in about 20 minutes following eight steps, with the tools in the box.
What is the difference between M90 and M90D? The M90D replaces the mesh seat with a soft sponge cushion. Everything else is the same.
Is the M90 certified? Yes, the gas lift and mechanism are BIFMA and SGS certified, and the aluminium base passed a 1136 kg static pressure test.
Can I buy the M90 in bulk? Yes. Stock orders have no minimum, and custom orders start at 50 units per SKU with 3 to 7 day stock lead times.
Conclusion
El SIHOO M90 is worth recommending for home offices, study desks, and everyday computer work. Its split backrest and spring loaded lower section make it one of the better budget chairs for adaptive lumbar support, and it delivers certified build quality at a price that undercuts chairs with fewer features. It is built for the average adult desk worker whose needs match a fixed seat depth and a height up to 188 cm, and the standard three year coverage suits most home and office buyers. If you need adjustable seat depth or a longer warranty, the Doro C300 and the wider Doro line cover those needs. Pick the mesh or sponge variant that matches the climate, and the M90 will do its job day after day.
