Desworthy Editorial Team
Desworthy editorial reviewer focused on ergonomic chair research, desk tech, affiliate disclosure, and practical UK home office buying decisions.
Last reviewed on by Desworthy Editorial Team.
Source information was checked on 29 September 2026. The editorial update date above does not mean prices, availability or retailer terms were checked again. Confirm those details with the retailer before buying.
AI Summary
- Sihoo's UK M18 page suggests users from 150 to 180 cm, so 185 cm is outside its stated fit range. Source 1
- The headrest moves and pivots, but its adjustment range cannot tell us whether it will touch your neck or the back of your head.
- Test upright and reclined positions before choosing the M18 for a taller user. Source 1
Decision table
| Situation | Practical choice |
|---|---|
| Over 185 cm and unable to sit-test | Seek a model with a suitable stated range and clear return terms. |
| Headrest pushes the head forwards in a trial | Rule out that fit, even if the rest of the chair feels comfortable. |
What to do
Measure from the seat to the head contact point you actually want. Ask the retailer for the highest headrest position relative to the seat, not merely the travel of the headrest alone. Creative Bloq reported a positive hands-on impression of the M18 headrest, but did not publish a 185 cm-plus contact-point test. Source 1 Source 4
Why overall height cannot answer the headrest question
The 150–180 cm recommendation and the headrest's stated vertical travel are both manufacturer figures, but neither provides the highest head-contact point measured from the compressed seat. Two people of the same standing height can have different seated torso and neck lengths. Ask for a seat-to-headrest measurement with the backrest in the position you would actually use, then compare it with your own seated measurement. SIHOO's UK M18 page supplies the fit band; it does not publish a 185 cm-plus contact study.
During a sit test, check upright typing and a normal recline separately. The headrest should meet the intended contact area without pushing the head forward. A reviewer finding the headrest comfortable does not establish that it will fit your proportions. If remote buying is unavoidable, get the seller's return conditions in writing first.
Frequently asked questions
Is the headrest travel enough to prove fit?
No. Backrest height, neck length and posture also matter.
Is 180 cm a safety or load limit?
No. It is the brand’s suggested user-height limit.
Can I simply remove the headrest?
Check the assembly instructions and warranty implications first.
Should all tall buyers switch to the S300?
No. Its wider suggested height range still needs a personal sit test.
Sources and citation notes
Specifications and policies are attributed to their original publishers. Named hands-on reviews are attributed to the reviewer and tested version. The decision advice is editorial synthesis, not a clinical, laboratory or transaction result. Check version-specific details and current terms before buying.
- [1] SIHOO UK M18 specification
- [2] SIHOO UK Doro S300 specification
- [3] HSE DSE workstation checklist
- [4] Creative Bloq, Beren Neale, hands-on M18 review (2024)
Sources were checked on 29 September 2026.
Related Sihoo UK guides
- Which Sihoo chair is least likely to crowd broad shoulders?
- Can you remove the S300 or C300 headrest without damage?
Note: This article is for reference only.