Front view of black Sihoo M18 ergonomic chair in Australia with black frame and seat, mesh back, and adjustable headrest
Rear view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its mesh back and support structure
Right-side profile of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its ergonomic silhouette
Angled front-left view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its ergonomic structure
Rear angled right view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its supportive backrest design
Woman seated on a black Sihoo m18 ergonomic chair in Australia on a white background highlighting proper posture and comfort
Woman sitting on a black sihoo m18 ergonomic chair in Australia with expandable footrest and headrest highlighting comfort and support
Left-side view of black Sihoo M18 ergonomic chair in Australia with expandable recline and footrest on a white background highlighting adjustable comfort
Front view of black Sihoo M18 ergonomic chair in Australia with built-in footrest on a white background highlighting adjustable comfort
Rear view of black Sihoo M18 ergonomic chair in Australia with footrest on a white background highlighting its supportive mesh back design
Angled front-left view of black Sihoo M18 ergonomic chair in Australia with footrest on a white background showcasing its ergonomic form
Full front view of grey Sihoo M18 ergonomic chair in Australia on a white background highlighting its ergonomic seat and armrest design
Full back view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its mesh backrest and support design
Rear angled left view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its supportive backrest design
Angled front-right view of black Sihoo M18 ergonomic chair in Australia on a white background highlighting its modern ergonomic design
Left-side view of gray Sihoo M18 ergonomic chair in Australia on a white background highlighting its ergonomic profile
Front-left view of gray Sihoo M18 ergonomic chair in Australia on a white background highlighting its clean ergonomic design
Front-right view of gray Sihoo M18 ergonomic chair in Australia on a white background highlighting its sleek ergonomic design
Right view of black Sihoo M18 ergonomic chair in Australia with expandable recline on a white background highlighting adjustable comfort
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SIHOO M18 Ergonomic Office Chair

$279.00 $469.00
Save $190.00
Free shipping with delivery in 1-5 days
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3-Year Warranty
30-Day Returns
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FAQs

The M18 is designed for users from 150 cm to 190 cm tall. The seat height adjusts from 46 cm to 55 cm, the seat is 51 cm wide and 46 cm deep, and the headrest and lumbar support each adjust independently, so most people in that height range can dial in a comfortable fit for a standard desk.
The M18 is rated for users up to 136 kg. The steel-reinforced frame, five-star base and gas lift are all specified to that load for everyday office use.
The lumbar pad is dual-adjustable: 4 cm up and down and 2 cm forward and back, so you can seat it under the natural curve of your lower back rather than settling for a fixed height. The backrest reclines from 110° to 126° on a tilt-lock mechanism, so you can lean back for a break and lock the angle in place.
Seat height 46 to 55 cm; overall chair height 107 to 130 cm; 2D armrests with 7 cm of height and 6 cm of depth adjustment; headrest with 11 cm of height adjustment over 8 levels plus 45 degrees of rotation; lumbar support 4 cm up/down and 2 cm forward/back; backrest reclining from 110° to 126° with a tilt lock.
Allow around 15 to 20 minutes for one person. The chair ships flat-packed with all bolts and an Allen key included, so no extra tools are needed. The SIHOO Australia YouTube channel has a step-by-step M18 unboxing and assembly video if you would rather follow along.
Every M18 sold by SIHOO Australia carries a 3-year warranty. If a part fails under normal use, we ship a replacement part to you rather than asking you to freight the chair back.
Orders are dispatched the next business day from our Sydney, Melbourne, Brisbane or Perth warehouse and usually arrive within 1 to 3 business days. Delivery is free Australia-wide.
Yes. We offer a 30-day change-of-mind return on the M18, provided the chair is unused and in its original packaging. Contact our Australian support team to arrange the return.
All three fit users from 150 cm to 190 cm; the M18 is rated to 136 kg, the M18 Pro to 136 kg and the M57 to 150 kg. The M18 Pro keeps the M18's mesh back and cushioned seat but adds a self-weight-sensing recline, 4D linked armrests that move with the backrest, a moth-shaped elastic lumbar pad and a dual-joint headrest; it is the pick for six-plus hours a day at the desk. The M57 swaps the cushioned seat for a full-mesh seat, adds 3D armrests and a deeper 46 cm seat, so choose it for maximum airflow. The M18 remains the best value if you want a padded seat and sit for under four hours a day.

Frequently Asked Questions About the SIHOO M18 Ergonomic Office Chair

Hours at your desk. Under four hours a day, the base M18's 2D armrests and dual lumbar support are enough. Six hours or more, the M18 Pro's 4D linked armrests and self-weight sensing recline are worth the extra $90.

The SIHOO M18 ergonomic chair is suitable for home office setups, study environments, and professional workspaces where ergonomic comfort and posture support are important during daily work.

Yes. The Black with Leg Rest variant adds a fold-out footrest.

Yes. The SIHOO M18 includes adjustable armrests that help support different sitting positions and workspace setups.

The SIHOO M18 uses breathable mesh materials designed to improve airflow and comfort during long sitting hours and warmer Australian conditions.

Seat height 46 to 55cm, seat width 51cm, seat depth 46cm. Overall chair height is 107 to 130cm.

136kg (300lb), suited to users from 150cm to 190cm tall.