Boulies OP300 review: Excellent adjustability meets everyday comfort

Choosing one of the best office chairs is a lot more important than you might initially think. At the end of the day, the chair you sit in every day directly affects your posture, comfort and, realistically, whether you end up needing a trip to the chiropractor a few months down the line. Finding one that actually suits your body and working style is a pretty key decision.

Thankfully, that’s where we come in. The latest chair to arrive for testing is the OP300 office chair from Boulies, a brand responsible for several chairs we already recommend to readers. Naturally, that meant expectations were fairly high going into this review.

Price and availability

The OP300 has an RRP of £289.99 via Boulies’ online store, regardless of which material option you choose. It’s currently only available in black, with the choice between a standard mesh or padded mesh backrest. I’ve been testing the padded mesh version, which adds a little more cushioning and support compared to the regular mesh option.

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At the time of writing, Boulies is also running a spring sale, bringing the price down to £259.99. Take a look below:

Boulies OP300 : was £289.99 now £259.50 at BOULIES INC

Don't forget to use the code SS30 at checkout to get the full £30 off.

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Unboxing and set up

I can’t take full credit for the setup process, as Beth, T3’s Home Editor, actually handled the assembly. What I do know is that the chair arrived in a very large box, so getting it unpacked and built quickly became a priority. Thankfully, setup only took around 25 minutes in total, which is considerably quicker than some office chairs we’ve tested previously.

Beth also mentioned that a lot of the main hardware arrived pre-installed, which made things much easier. There were only a handful of bolts to tighten with the included Allen key, alongside attaching the castor wheels to the base. The fiddliest part was balancing and attaching the backrest onto the main frame, but aside from that, the process was rather seamless.

Design and features

A huge part of the OP300’s design centres around adjustability. There are four levers in total – three on the right-hand side and one on the left. The left lever controls the seat depth, allowing you to move the seat forwards or backwards, whilst the right-hand controls manage the chair height, recline and tilt lock.

It uses Boulies’ multi-tilt mechanism, which gives it a much wider range of movement than a standard office chair. The backrest reclines between 85° and 113°, whilst the seat itself can tilt and rock independently to better support different sitting positions throughout the day. One feature I particularly like is the forward seat tilt, which slightly raises the front edge of the chair to encourage a more upright posture.

The OP300 is also clearly designed to suit a broad range of body types. Alongside seat depth adjustment, you get a height-adjustable backrest and a multi-directional headrest that can be adjusted in both height and depth. The armrests are especially flexible too, offering multiple height, rotation and forward/backward positions depending on how you prefer to sit when working.

The headrest itself is also fairly straightforward to adjust – you just press the button on the stem and slide it up or down. However, one thing worth noting is that you can’t adjust the tilt angle of the headrest itself, which slightly limits customisation compared to some premium ergonomic chairs.

Build quality feels strong for the price point, particularly considering this sits firmly in the mid-range ergonomic category. It uses a reinforced plastic frame, heavy-duty gas lift, nylon casters and a sturdy five-star base that all feel reassuringly stable once assembled.

Performance

When it comes to comfort, the OP300 leans more towards softer ergonomics rather than aggressively firm lumbar support. The seat cushion is wide and generously padded, making it comfortable over long periods of sitting, whilst the curved backrest follows the natural shape of your spine nicely. I also found adjusting the seat depth slightly forward helped provide much better upper thigh support throughout the working day.

That said, there are a couple of things worth mentioning. The lumbar support itself isn’t independently adjustable, which some people may miss if they prefer more tailored lower-back support. It’s something I really liked on the Slouch Task One office chair, especially on longer workdays where extra support becomes more important. Having that added flexibility here would’ve been appreciated, especially long term.

I also found adjusting the backrest height slightly fiddly. This is something I was aware of after reading Toms Guide's review, which was very accurate. To change it, you need to pull the backrest upwards until it clicks into one of three height positions, but if you pull too far, it resets back to the lowest setting again. It’s not a huge issue, but definitely one to know about.

Verdict

The Boulies OP300 office chair gets a lot right, especially when it comes to comfort and adjustability. It feels well-built and supportive over long working days, with features like the forward seat tilt and padded mesh backrest making a noticeable difference in everyday use. Whilst the lack of adjustable lumbar support may be a drawback for some, the overall experience still feels impressively premium for a mid-range ergonomic chair.

Alternatives to consider

If integrated lumbar adjustment is a must-have for you, I’d probably point you towards the slightly cheaper Boulies EP200 instead, which still delivers a very similar comfort level.

Alternatively, if your budget stretches much further, the Herman Miller Aeron remains one of the best ergonomic office chairs you can buy, particularly thanks to its excellent PostureFit SL support system.