SIHOO Doro S300 (Black, 67cm x 74cm)

Ergonomic Mesh Office Chair

From: Sihoo

The SIHOO Doro S300 is a mesh office chair built for people who sit at a desk for long stretches. It uses a four-axis linkage system that tracks your sitting position and spreads pressure across your hips and back. The aluminium frame components give it a solid, heavy feel that many buyers compare favourably to chairs costing far more.

What makes this chair different? The bionic dynamic lumbar support moves with your spine rather than sitting fixed in one place. Combined with a shock-absorbing suspension system, it aims to recreate the feel of sitting on soft ground rather than a rigid seat base.

The 6D armrests adjust in height, width, angle and depth, so your arms stay supported no matter your posture. The breathable mesh back keeps you cool during long sessions. At £699.99, it sits at a premium price point but includes a 5-year spare parts guarantee.

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Product Features

Dual Dynamic Lumbar Support - The lumbar mechanism moves through 6 dimensions to match the natural curve of your lower back. This matters because static lumbar supports often miss the mark for different body shapes. Here it adjusts automatically as you shift position, reducing lower back fatigue during long work sessions. 6D Coordinated Armrests - Each armrest adjusts for height, width, angle and front-back position independently. Why does this help? Most desk chairs offer limited armrest movement, forcing your shoulders into awkward angles. These armrests let you set a precise position for typing, mousing, or resting, cutting shoulder and wrist strain. Shock-Absorbing Suspension - A built-in suspension system cushions the seat base similarly to how a mattress responds to body weight. This reduces pressure points under the thighs and tailbone during long sitting periods, which is useful for anyone working 6+ hours a day at a desk.

Four-Axis Coordinated Recline - As you lean back the chair captures your sitting posture and redistributes weight evenly between your back and hips. This stops the sudden pressure spike you get with basic recline mechanisms and it supports 3 fixed reclining positions for controlled movement. Tension Adjustment Handle - The recline resistance is tuneable using aerospace-grade elastic plates, so you can match the tension to your own body weight. A lighter person and a heavier person will feel the same smooth resistance rather than one feeling stuck and the other flopping back. Aluminium Frame Construction - The main support structure uses cast aluminium rather than plastic. This gives the chair a stated weight capacity of 150kg and adds long-term durability compared to chairs built with lower-grade frame materials.

FAQs

How much weight can the SIHOO Doro S300 support?

The chair has a maximum weight capacity of 150kg. The aluminium frame and reinforced base are designed to hold this weight while maintaining stability during recline and swivel movements.

How long does assembly take?

Most buyers report assembly takes around 20 minutes. The seat and backrest arrive as pre-built units with the mechanism already attached, so you mainly need to bolt the base together, attach the seat, then click the backrest into place. All tools are included in the box.

Does the chair recline fully flat?

The backrest offers 3 fixed reclining positions rather than a continuous recline range. Some reviewers found this limiting compared to chairs with infinite-lock recline, while others found the 3 positions sufficient for switching between upright work and a relaxed lean-back.

Is the seat material warm or cool to sit on?

The seat and backrest use a breathable mesh material described by reviewers as soft and cool during extended sitting. This makes it suitable for warmer offices, though a few buyers in cooler climates felt the mesh seat base was less comfortable than a padded cushion during winter months.

Can the armrests be locked in place?

The armrests adjust across 6 dimensions using screw fixings. Most buyers found that fully tightening the screws after initial adjustment kept the armrests secure. A small number of reviewers reported the armrests loosening over time with heavy use.

What is included in the box?

The chair ships with the seat and backrest unit, base, casters, arm pads, cushion components and all assembly tools and instructions needed to put it together.

Does SIHOO offer a warranty or spare parts?

SIHOO states spare part availability for 5 years from purchase. The company also offers dedicated customer support 7 days a week. Some reviewers reported mixed experiences with warranty claims for mechanical faults, though replacement parts were sent when issues were reported.

Is this chair suitable for carpeted floors?

The standard casters are designed for hard floor surfaces. At least one reviewer noted the chair did not roll as smoothly on carpet and wished a carpet-specific castor option was available, which is not currently offered by SIHOO for this model.

SIHOO Doro S300 (Black, 67cm x 74cm) Specs

Spec	Detail
Brand	SIHOO
Model Name	DORO S300
Model Number	S300-JP
Colour	Black
Material	Mesh
Frame Material	Aluminium
Seat Material	Mesh
Width	67cm
Depth	74cm
Height	127cm
Seat Depth	46cm
Product Weight	25kg
Maximum Weight Capacity	150kg
Base Movement	Swivel
Reclining Positions	3
Tilting Function	Yes
Assembly Required	Yes
Recommended Use	Office
Room Type	Office
Age Range	Adult
Surface Recommendation	Hard Floor
Indoor/Outdoor	Indoor
Item Shape	L-Shape
Arm Style	Rounded
Cushion Style	Square-shaped
Leg Style	Tapered
Leg Form Factor	Ergonomic
Pattern	Solid
Care Instructions	Wipe Clean
Country of Origin	China
Spare Parts Availability	5 years
Inclusions	Arm Pad, Caster, Cushion