Product Review · Ergonomic Office Chairs · #9 Ranked
Sihoo M18
Ergonomic office chairs — budget mesh high-back with headrest · Reviewed by Katie · amazon.com live, Sept 9 2026
Why it scored a 74
At $169.99 the Sihoo M18 is Amazon's perennial best-selling budget ergonomic chair, a mesh high-back with a headrest and a real up-and-down, in-and-out lumbar. Value leads at 86 and Satisfaction sits at 84, but Features drags at 55 and Quality at 58: the seat depth is fixed, the armrests only move up and down, and owners report the foam flattening and the chair running small for anyone over six feet or ten-hour days. That combination lands it at 74, just under our buy line. It is for a shorter, lighter user on a tight budget who wants a headrest and adjustable lumbar and will not sit all day.
What you're getting
- 330 lb weight rating, BIFMA certified; chair weighs 37.1 lb
- Adjustable lumbar moves both vertically and horizontally
- Headrest: 3.9 in vertical travel and 45° pivot
- Recline up to 126° with tilt lock and tension control
- Seat height 18-22 in gas lift; seat width 20.1 in, depth 17.9 in (fixed)
- Polyester mesh back with W-shaped foam cushion; PU silent casters
- Overall 28 in W x 27 in D x 44-51 in H
- 2D height-only armrests; 3-year warranty (some listings cite 2 years)
ViperScore breakdown
At a glance
- 330 lb rating, BIFMA certified; 37.1 lb chair
- Recline to 126° with tilt lock; seat 18"–22"
- Adjustable lumbar; 2D arms; 3-year warranty
- Price$169.99
- TierErgonomic office chairs — budget mesh high-back with headrest
- Category rank#9 of 10
