SIHOO Doro C300 vs C300 Pro: What the Pro Adds and What It Costs

Research note: This comparison uses SIHOO's published store specifications (US, UK and EU official stores), not a hands-on Chairpedia test. Figures are quoted as SIHOO states them, with the store they come from.

Introduction

The SIHOO Doro C300 and the SIHOO Doro C300 Pro share the same idea: a mesh back and seat, a lumbar pad that follows the backrest without manual adjustment, a separate adjustable headrest and a recline that adapts to the sitter's weight. In one sentence: the C300 Pro adds an adjustable seat depth and 6D armrests and lists higher, while the C300 keeps 4D arms and the lower regular price. Both list a 330 lb maximum load and a three-year warranty on the SIHOO US store, so the choice is about adjustment and price rather than capacity.

At a glance

SIHOO Doro C300 — strengths and weaknesses

Documented features: SIHOO's US store lists general dimensions of 28 in wide, 28 in deep and 42-49 in high, a 330 lb maximum load and 4D coordinated armrests that move up and down, left and right, forward and backward with a tilt linkage. The UK store's technical specifications give a seat height of 47-55 cm (18.50-21.65 in), a seat depth of 43.5-46 cm (17.13-18.11 in), a seat width of 49.5 cm (19.49 in), an armrest height range of 6.5 cm (2.56 in), recline angles of 110°, 120° and 130°, a net weight of 23.20 kg (51.15 lb) and a recommended user height of 150-180 cm. The lumbar is described as self-adaptive and dynamic, and the headrest as a 3D mechanical headrest. The warranty on the US store is three years.

Check before buying: The C300's recommended user height on the UK store stops at 180 cm, so taller sitters should look at the Pro's wider range. The US store gives a single seat depth figure while the UK store gives a range; we show the UK range. The regular price on the US store is $559.99 (Black) to $569.99 (White) for the Standard Version; the Footrest Version costs more.

SIHOO Doro C300 Pro — strengths and weaknesses

Documented features: SIHOO's US store lists general dimensions of 28 in wide, 28 in deep and 45-51 in high, a seat depth of 16.81-17.76 in (the EU store gives 42.7-45.1 cm), a maximum hip width of 20.28 in (51.5 cm on the EU store), a 330 lb maximum load, a product weight of 55.34 lb and a three-year warranty, and says the chair is designed for users from 5 ft to 6 ft 3. The EU store gives a seat cushion height range of 46-56.7 cm (18.11-22.32 in), and the UK store quotes a maximum recline angle of 135°. The 6D coordinated armrests move up and down, left and right, front and back, inward and outward, with a tilt-lock and a linked recline. SIHOO calls the lumbar the BM (Body Movement) Tracking System: it conforms to the backrest as you move rather than being set by hand.

Check before buying: The Pro is the heavier chair at 55.34 lb against the C300's 51.15 lb, which matters if you carry the box upstairs. SIHOO's US label "chair back lifting height" for the Pro matches the overall height range, so we do not treat it as a backrest figure. The regular price on the US store is $789.99 for the Black Standard Version up to $839.99 for the White Footrest Version.

How they differ

Seat depth. The Pro's seat depth is listed as adjustable (16.81-17.76 in on the US store). For the C300, SIHOO's UK store lists a 43.5-46 cm range while the US store gives a single figure, so if seat-depth adjustment is a deciding factor, the Pro is the one SIHOO advertises for it.

Armrests. 4D on the C300 against 6D on the Pro; the two extra directions are inward and outward movement, plus a tilt-lock. If you type with your elbows close to your body or want the pads to swing toward the keyboard, that is the practical difference.

Seat height and user height. The C300 covers 47-55 cm and recommends 150-180 cm users; the Pro covers 46-56.7 cm and is designed for users from 5 ft to 6 ft 3. Taller sitters get more room on the Pro.

Recline. The C300 lists three angles (110°, 120° and 130°); the Pro's UK page quotes a maximum of 135°.

Weight and price. The Pro weighs 55.34 lb against 51.15 lb and lists at $789.99-$839.99 against $559.99-$569.99 for the C300 Standard Version.

Who should buy which

The Doro C300 fits someone of average height who wants SIHOO's self-adjusting lumbar and a 3D headrest at the lower list price, and does not need the arms to move inward or the seat to slide. The Doro C300 Pro fits taller sitters (up to 6 ft 3 by SIHOO's guide), people who want to set the seat depth, and anyone who wants armrests that move inward and outward. If you are considering the Pro, also look at the newer C300 Pro V2, which SIHOO lists at a lower regular price with 8D armrests and a manually adjustable lumbar pad.

Sources

• SIHOO US Official Store — Doro C300 and Doro C300 Pro product pages (specifications, regular prices), checked 2026-10-08.
• SIHOO UK and EU official stores — Doro C300 and Doro C300 Pro technical specifications, checked 2026-09-29 and 2026-10-08.

Bottom line

Same family, same 330 lb US load rating and three-year warranty. The C300 Pro's additions are concrete — an adjustable seat depth, 6D arms, a wider seat height range and a 135° maximum recline — and so is its higher list price. Compare the live sale prices on the SIHOO store before deciding, because the gap between the two changes with promotions.