SIHOO Doro C300 Ultra V2

The Doro C300 Ultra V2 is the highest model in SIHOO's Doro C300 line. SIHOO builds it on a reclining base it calls the Zero-Gravity Space Chassis (fiberglass plates combined with a four-spring suspension), with a backrest that glides on a dual-track, dual-spring mechanism as you lean back (SyncroFlex), a sacral-lumbar pad that moves up and down and has three support levels (Domino 2.0), 8D armrests, a 3D headrest, an aluminium-alloy backrest frame and a mesh back and seat. The US store sells it only as the Footrest Version, in Black or White.

Official figures (SIHOO US store): seat depth 16.9"–18.5" (1.6" of travel), seat width 20.5", backrest height 21.1"–24.2" above the seat (7 settings over 3.2"), maximum load 330 lbs, net weight 57.10 lbs and recline positions at 105°, 120° and 135°. The seat height (47.5–55.5 cm, about 18.7"–21.9") and the overall size (70 cm wide at the base, 74 cm deep, 113–133.5 cm high) come from the dimension drawing in SIHOO's specification panel, not from the written spec list, and that drawing labels the seat depth about 0.5 cm shorter than the written figure. SIHOO does not publish a recommended user height for this model.

Warranty: 3 years, covering manufacturing defects (SIHOO US store).

Price: the SIHOO US store lists $679.99 (Black) and $689.99 (White). On 2026-10-13 the store showed $609.99 and $619.99; we record the list price only, so check the live page before ordering.

What to check before ordering: the seat height is published only in a drawing, so compare 47.5–55.5 cm with your desk height and leg length. There is no version without the footrest on the US store, and the chair weighs 57.10 lbs (SIHOO's UK store says it ships in two packages).