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SIHOO

SIHOO Doro C300 Ergonomic Office Chair with Ultra Soft 3D Armrests, Dynamic Lumbar Support for Home Office Chair, Adjustable Backrest Desk Chair, Swivel Big and Tall Computer Chair Black

Very Good

Mesh back
3D arms
Headrest

$299.99~~$349.99~~

You save $50.00 off the list price

In stock on Amazon.com

Specs verified August 2026

Amazon.com data updated October 13, 2026, 2:34 pm ET. Price and availability are accurate as of the time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply.

Ergo Score Breakdown

Ergo Score: 52/100

Adjustability 17/40

Armrests8/103D armrests: 8/10

Seat height4/6adjustable, 3.3 in range: 4/6

Seat depth0/5Not listed by the seller

Lumbar adjustment0/7Not listed by the seller

Recline2/2recline to 112 degrees: 2/2

Tilt lock3/3tilt lock: 3/3

Tilt tension0/3Not listed by the seller

Advanced tilt0/4intelligent gravity mechanism: 0/4

Support 20/30

Lumbar support12/12lumbar support: 12/12

Upper back support4/4headrest: 4/4

Headrest adjustment0/2Not listed by the seller

Cushion0/5Not listed by the seller

Seat edge0/3Not listed by the seller

Breathable back4/4mesh back: 4/4

Build 15/30

Warranty3/93-year warranty: 3/9

Weight capacity0/6Not listed by the seller

Certifications5/5BIFMA, SGS: 5/5

Base2/3metal base: 2/3

Gas lift2/2Class 4 gas lift: 2/2

Owner rating3/54.2 stars from 1316 reviews: 3/5

Comfort Index

Comfort Index: 52/100

Seat cushionNot listed by the seller

Cushion thicknessNot listed by the seller

Recline5/15

Breathable back15/15

Headrest10/10

Armrests10/10

Owner rating12/25

Specifications

Seat height range	16.1 to 19.5 in
Seat width	20 in
Seat depth	16.54 in
Seat depth adjustable	Not listed by the seller
Seat cushion	Not listed by the seller
Cushion thickness	Not listed by the seller
Back material	Mesh
Backrest height	Not listed by the seller
Backrest width	Not listed by the seller
Armrests	3D adjustable
Lumbar support	Dynamic
Lumbar adjustments	Not listed by the seller
Headrest	Yes
Max recline	112 degrees
Tilt mechanism	intelligent gravity mechanism
Base material	Metal
Casters	Hard floor
Gas lift	Class 4
Weight capacity	Not listed by the seller
Chair weight	Not listed by the seller
Overall height	42.13 to 50.4 in
Warranty	3 years
Certifications	BIFMA, SGS

Fit Guide

A comfortable seat height is about a quarter of your body height. Here is how this chair's listed seat range lines up (how we rate).

Your height	Seat range	Fit
4'11" to 5'3"	16.1 to 19.5 in seat (ideal about 15.3 in)	Seat may be too high
5'4" to 5'7"	16.1 to 19.5 in seat (ideal about 16.4 in)	Good fit
5'8" to 5'11"	16.1 to 19.5 in seat (ideal about 17.4 in)	Good fit
6'0" to 6'3"	16.1 to 19.5 in seat (ideal about 18.4 in)	Good fit
6'4" and up	16.1 to 19.5 in seat (ideal about 19.3 in)	Good fit

3D armsDynamic lumbarHeadrestMesh backMetal base

What We Like

BIFMA and SGS marks, a metal base and a Class 4 gas lift are all listed, giving a build sub-score of 15.
The lumbar support is dynamic, and the arms are 3D with depth and pivot adjustment confirmed in the listing.

Watch Out For

The seat tops out at 19.49 inches, one of the lowest maximum seat heights among published chairs, so longer-legged sitters may find it sits low.
The title says Big and Tall, but the listing does not state a weight capacity, so the load limit is unconfirmed.

At a Glance

A seat that starts at 16.14 inches, 3D arms and a dynamic lumbar define the Doro C300. It reclines to 112 degrees with an intelligent gravity mechanism.

Who This Chair Is For

Shorter sitters who need a seat that goes down to 16.14 inches.
Buyers who like a deep review base, with 1316 reviews averaging 4.2 and both BIFMA and SGS marks listed.

Who Should Look Elsewhere

Sitters who read Big and Tall as a load rating, because the listing does not state one.
Sitters who want a stated headrest height or angle control, because the listing does not state either for the headrest it names.

The Doro C300's gravity tilt, and what else it adjusts

The tilt mechanism is named as an intelligent gravity mechanism, the recline reaches 112 degrees and three lock positions are listed. The lumbar is dynamic and the arms are 3D. A headrest is listed, but the listing does not state its height or angle adjustment, or tilt tension. The seat height runs from 16.14 to 19.49 inches.