Our Take
The SIHOO Doro C300 is a mid-range ergonomic office chair that sits comfortably in SIHOO's lineup – not their budget entry-level stuff, but not their premium flagship either. It's genuinely designed for people who spend 6-8 hours a day working at a desk and actually want their chair to support their back rather than slowly destroy it. If you've been sitting in a cheap gaming chair or an old office cast-off and wondering why your lower back feels like it's been in a vice by 3pm, this is the kind of chair that makes a real difference.
The C300 features a high-density foam backrest with proper lumbar support that actually contours to your spine rather than just being a flat sheet – this isn't about marketing fluff, it's about the fact that your lower back needs different support than your mid-back. The seat itself is wide enough that you're not perched on an edge (we're talking genuinely comfortable for people up to around 120kg), and the height adjustment gives you a full 120mm of range, which matters when you're trying to dial in your desk ergonomics properly. The mechanism is a standard pneumatic cylinder – reliable, smooth, no weird creaking – and the 5-star base with smooth-rolling casters means you're not wrestling with the chair to move around your desk.
Against alternatives like the Herman Miller Aeron (which costs several times more), the C300 is honest value without pretending to be something it's not. Compared to basic flat-back office chairs at similar price points, you're getting actual lumbar engineering rather than a design that looks vaguely office-y. Before ordering as a UK buyer, check your ceiling height – the backrest does sit fairly tall – and make sure you've got a tape measure handy because office chair sizing isn't one-size-fits-all. Everything you need comes in the box, though you'll want to give yourself a proper 30 minutes to assemble it rather than rushing it.
Key Features
High-density foam backrest with integrated lumbar support curve
Pneumatic gas cylinder height adjustment with 120mm range
5-star base with smooth-rolling nylon casters
Seat width of approximately 50cm with density-rated foam for durability
360-degree swivel with tilt mechanism and locking function
Maximum weight capacity of approximately 120kg
Our Verdict
Buy this if you genuinely spend long hours at a desk and your current chair is making you miserable – it's a proper step up in support without breaking the bank. Look elsewhere if you need neck support included, have a confined workspace, or want premium materials like mesh backing.