Under £100, you're buying a set of trade-offs, so know which specs actually change your day.
Weight capacity. This is the first number to check. The SONGMICS and TRIUMPHKEY are rated to 150 kg. The Vfalcon is sold with a 150 kg weight capacity, but our review records 132 kg, and the Racingreat is rated to 120 kg. Buy with headroom rather than right at the limit.
Armrests. The jargon runs 1D to 4D. Height-only (1D) chairs like the Racingreat move up and down only. The SONGMICS folds but doesn't adjust for positioning. The TRIUMPHKEY's 3D armrests move on more axes, and the Vfalcon's linkage armrests move with the recline so your elbows stay supported when you tilt back. If you type for hours, armrest adjustment matters more than the recline angle.
Gas lift class. A Class 3 gas lift, as fitted to the Vfalcon and TRIUMPHKEY, is a safety and longevity marker. It's the cylinder that holds you up, so it's not the place to cut corners.
Breathability. Every chair here uses PU leather, and our reviews flag warmth as the shared weakness. PU wipes clean and looks smart, but it doesn't breathe like fabric or mesh. If you overheat easily, a summer session will get sticky on any of these. We cover two fabric chairs in the next section.
Foam and the long game. Budget foam compresses. Our Racingreat review puts noticeable softening at 12 to 18 months of heavy daily use. Our Vfalcon review rates its cold-moulded high-density foam as holding its shape better than budget alternatives.
The common mistake. Expecting a sub-£100 chair to fix an existing back problem through a full eight-hour workday. None of these are engineered for that. They're comfortable upgrades for gaming and study in shorter stretches. If you have real back issues and sit all day, budget more or add a separate lumbar support.