Sihoo Ergonomic Office Chairs Australia

Sihoo is the brand most Australians meet first when they go looking for an ergonomic chair that is not a $2,000 purchase. The range is wide — twelve chairs between the entry-level M18 and the flagship DORO-C500 — and the model names do not explain themselves, so this page does: which Sihoo suits which body, how the M-series differs from the DORO series, and what you get by buying from an authorised Australian dealer with showrooms rather than a marketplace listing.

Every Sihoo here is held in Australian stock, carries Sihoo's 3-year warranty handled through Aussie Chair, ships free Australia-wide, and can be sit-tested in Sydney or Melbourne before you buy.

The Sihoo range in one minute

• M18 — the value task chair. Mesh back with a W-shaped high-density foam seat for people who want cushioning, lumbar adjustable in height and depth, lockable recline to 126°, rated to 150 kg. Seat height 40.5–48.5 cm; best for roughly 167–188 cm.
• M57 — the all-rounder and Australia's best-known Sihoo. Full mesh seat and back, dual-adjustable lumbar (height and depth), 3D armrests, 126° lockable recline, headrest with 8 cm of travel, rated to 150 kg. Seat height 42–52 cm suits roughly 155–185 cm.
• M57 Pro — the M57 with 4D arms, adaptive lumbar that flexes as you shift, a deeper 134° recline and a double-joint headrest. For people who want set-and-forget back support with more fine-tuning everywhere else.
• Vito M90 — adaptive lumbar that tunes its strength to your body weight, 130° recline with three locks, elastic Textilene mesh, aluminium base, rated to 150 kg. Suits 165–188 cm and anyone who refuses to fiddle with dials.
• B100 Pro — adaptive floating sacral support on spring suspension, flip-up 4D arms so the chair slides under the desk, an oversized headrest, 135° recline, 150 kg, optional built-in footrest.
• S100 — a split backrest: one panel for the shoulders and two independent lumbar wings below it. Sliding seat depth 38.5–43.5 cm, backrest height 46–54 cm, 4D arms, 135° recline, all mesh.
• V1 — the comfort pick for shorter-legged sitters: sliding seat depth, 90–140° recline, five backrest heights, 4D arms, foam seat, rated to 120 kg.
• DORO-C300 Pro (Gen 1) — self-adaptive lumbar with Body Movement Tracking, 6D arms, adjustable headrest, seat depth 42.7–45.1 cm, 150 kg, fits 152–190 cm.
• DORO-C300 Pro V2 — the current best-seller, rebuilt around the DynaCore full-body support system: the lumbar pad slides down with your centre of gravity as you recline, 8D arms, 135° recline with locks at 105°, 120° and 135°, recline tension that auto-calibrates for 40–100 kg bodies, 4 cm seat slide, 150 kg, fits 150–190 cm.
• DORO-S300 — the anti-gravity recline chair. Two independent dynamic lumbar pads, 6D arms, an extra-soft mesh woven from Italian velvet with DuPont TPEE elastomer, a four-spring seat suspension, five backrest heights. Fits 150–190 cm.
• DORO-C500 — the flagship: anti-gravity recline plus pressure-sensing Domino 3D lumbar, 6D arms, a wide-angle 3D headrest, five backrest heights, 4 cm seat slide, Class 4 gas lift certified to BIFMA Level 4, footrest included. Fits 150–190 cm.
• XALLKING X5 Pro — the gaming chair for people who have outgrown racing seats: mesh, 6D bionic-joint arms, 95–138° recline, a three-zone backrest with interchangeable panels, a 64 cm retractable footrest, rated to 150 kg.

M-series or DORO: which family is right for you

The M-series chairs (M18, M57, M57 Pro, Vito M90) are conventional ergonomic task chairs done well. You set the lumbar, the arms and the recline once and they hold. They suit a single user, a fixed budget, and anyone replacing a worn-out office chair with something that will last.

The DORO series (C300 Pro, C300 Pro V2, S300, C500) adds mechanisms that move with you. The lumbar support tracks your spine as you shift — Sihoo calls it Body Movement Tracking. On the C300 Pro V2 and C500 the recline tension sets itself to your weight. On the S300 and C500 the anti-gravity mechanism makes a full recline feel weightless rather than like falling backwards. These suit people who sit eight hours and change posture constantly, shared desks where nobody adjusts anything, and anyone whose lower back goes quiet in a fixed-pad chair by mid-afternoon. The price step from an M57 to a C300 Pro V2 buys that movement, plus 8D arms and a seat-depth slide.

M57 vs M57 Pro vs DORO-C300 Pro V2: the three most asked-about Sihoos

The M57 is the right answer for most people most of the time. It covers the ergonomic essentials — lumbar in two axes, 3D arms, a headrest, a 150 kg rating and BIFMA testing — at the lowest price in the range for a full-mesh chair. The M57 Pro is worth the step if you want adaptive lumbar and a deeper recline, or if your forearms live on the armrests and you want 4D adjustment. The DORO-C300 Pro V2 is a different class of chair: the lumbar moves with your centre of gravity, the tension calibrates itself, the seat slides, and the arms are 8D. If you sit more than six hours a day, start with the V2 and work down only if the budget says so.

Fit: height, weight and seat depth

Most Sihoo chairs here — the M18, M57, Vito M90, B100 Pro, the DORO-C300 Pro and C300 Pro V2, and the X5 Pro — are rated to 150 kg and BIFMA tested; the V1 is rated to 120 kg, and the DORO-C500, S300, S100 and M57 Pro list their ratings on their product pages. Height fit matters more than weight with Sihoo: the M18 and Vito M90 suit taller sitters (from about 165–167 cm), the M57 runs from roughly 155 cm, and the DORO chairs cover 150–190 cm. If you are under 165 cm or have shorter legs, prioritise seat-depth adjustment — the V1, S100, DORO-C300 Pro, C300 Pro V2 and C500 have it; the M57 and M18 do not. The sit-test rule: two to three fingers between the front edge of the seat and the back of your knee, with your back fully against the lumbar pad.

Buying from Aussie Chair versus a marketplace listing

Sihoo chairs are widely sold through marketplaces, and the hardware is usually genuine. The difference is what happens after the box arrives. Aussie Chair is an official authorised Sihoo dealer: the 3-year warranty is handled through us in Australia, assembly questions are answered by people who have built every chair in this range, and you can sit in the M57, M57 Pro, DORO-C300 Pro V2, S300 and C500 side by side at our Sydney (South Granville) or Melbourne (Nunawading) showroom before you spend anything. Delivery is free Australia-wide, and we ship to New Zealand.

Living with a Sihoo

Assembly takes 20–30 minutes with the tools in the box; the DORO-C500 is designed to go together in under 20. Mesh needs nothing more than a vacuum brush and a damp cloth. Set the lumbar height first, then seat height, then armrests — in that order — and revisit the settings when you change desks or monitors. If you are weighing a Sihoo against a chair from another brand, our full ergonomic chair range and chairs for back pain pages compare them side by side.