Best Office Chair for Long Hours of Computer Use

Struggling with backache or stiff shoulders after a long day at your desk?

Here's the simple truth: the best computer chair for long hours is one that supports your posture, adapts to your body, and keeps you comfortable throughout the day, from morning until evening.

In this guide, we've carefully selected three of the most trusted ergonomic chairs from Sihoo—the C300, S300 and M57—each designed to provide long-lasting comfort for professionals and home workers alike.

Whether you're upgrading your home office or enhancing your workplace setup, this guide provides practical, UK-relevant advice to help you make informed choices.

Let's begin.

What to Look for in a Chair for Long Hours

When sitting for extended periods, comfort alone isn't sufficient — your chair must actively support your posture and help prevent fatigue. Based on expert testing and user feedback, these are the features that genuinely make a difference:

• Adaptive lumbar support — maintains the natural curve of your lower back throughout the day. Without it, slouching becomes almost unavoidable.
• Multi-angle recline with tension adjustment — enables you to shift your position and ease pressure on your spine, particularly useful during prolonged periods of concentration.
• Ensure the correct seat depth and height — your thighs should be well-supported without pressure behind the knees, with both feet resting flat on the floor.
• Adjustable armrests (minimum 3D) — help reduce strain on the shoulders and wrists by allowing the arms to rest comfortably at desk height.
• Breathable materials — such as mesh backs or hybrid fabrics — promote airflow and prevent discomfort, particularly in warmer environments.
• Quiet, stable build quality — no creaks, wobbles or flimsy plastic parts. You'll notice the difference within a few days of use.

If a chair lacks these features, it isn't designed for serious, long-term use — regardless of how appealing it may look. Always prioritise function over form if you value lasting comfort and support.

Top Picks: Best Sihoo Chairs for Sitting Long Hours

Sihoo Doro S300 — For Demanding Schedules & Precision Support

The S300 is built for intensive, full-day sitting with a strong focus on postural precision and mechanical smoothness.

It features a suspended, independently structured backrest with height adjustment, paired with a glass-fibre "anti-gravity" recline system that provides zero-resistance, tension-free movement.

The dual-zone lumbar support adapts instantly as your spine shifts, keeping pressure evenly distributed.

While the integrated headrest is not angle-adjustable, it offers ample height for taller users.

The chair's movement feels weightless yet supportive — ideal for professionals who spend most of their day seated and require dependable, dynamic back care without the rigidity of standard tilt systems.

Sihoo Doro C300 — For Responsive Support and Everyday Ergonomics

The C300 is designed for users who require reliable, adaptive support throughout a full working day, without incurring a premium price.

Its core strength lies in the flexible, self-adaptive lumbar support, which adjusts in tandem with the backrest as you recline, maintaining contact with your lower spine whether you are upright or leaning back.

The backrest tilt is preset at 105°, 120°, and 135°, providing sufficient variation for most working and resting positions without requiring the user to operate unnecessary controls.

The 4D armrests, while not the most rigid, are responsive and well-aligned with the chair's movement, supporting the arms during both typing and reclined use.

What distinguishes the C300 is its 3D-adjustable headrest, which allows for precise adjustment of both head height and neck angle — particularly useful for those who alternate between screen-based tasks and phone calls.

With a firm, breathable mesh seat and a dynamic feel, the C300 is well-suited to remote professionals and desk-based workers seeking reliable comfort and thoughtful adjustability.

Sihoo M57 — For Foundational Support and Budget-Conscious Buyers

The M57 offers essential ergonomic features in a straightforward, durable package — ideal for those upgrading from a standard chair without overcommitting financially.

Its manually adjustable lumbar system allows users to set both height and depth to match the natural curve of the spine. At the same time, the mesh seat and backrest promote constant airflow — particularly beneficial during longer sessions or in warmer indoor environments.

The 3D armrests are practical and stable, offering sufficient forearm support during typing and everyday use, though they are less refined in movement than those found on more advanced models.

The recline mechanism offers a tilt range of approximately 100°–126°, suitable for casual leaning, though without tension synchronisation.

Where the M57 truly excels is in its robust build quality, generously sized seat base, and overall practicality — it's understated yet delivers on the essentials.

This model is best suited to students, hybrid workers, or budget-conscious users seeking a dependable ergonomic foundation for daily use.

How to Choose the Right Chair for You

Not all ergonomic chairs are created equal, and not every user requires the same level of support. Choosing the right chair for long hours comes down to three key factors:

✅ Your sitting duration

✅ Your back and posture need

✅ How much adjustability will you use?

Based on in-depth testing and verified specifications, here's how the Sihoo S300, C300 and M57 compare in real terms — to help you choose the one that fits your body, your workflow, and your space.

Expert Comparison – Sihoo S300 vs C300 vs M57

Expert Guidance

• Choose the S300 if you need seamless reclining, adaptive lumbar support and all-day comfort — it's the only one here with an independently moving back and "weightless" recline.
• Choose the C300 if you want posture-friendly design with solid adjustability at a reasonable price — it covers all the essentials for focused desk work.
• Choose the M57 if you're on a budget or upgrading from a basic chair — it gets the fundamentals right without unnecessary extras.

Remember: the best chair is the one that fits you, not just the spec sheet.

FAQs

Is spending over £300 on a chair worth it?

Yes — if you're sitting for more than six hours a day. A well-designed ergonomic chair helps prevent strain, improves posture, and enables you to work comfortably for longer. Over time, it's far more cost-effective than frequent physiotherapy or lost productivity. Much like investing in a good mattress — it's not a luxury, it's a daily necessity.

Mesh or padded seat — which is better?

Mesh provides better airflow and maintains support, especially over long periods or in warmer indoor environments. Padded seats may feel softer at first, but they can trap heat and lose their shape over time. For most people sitting all day, a well-designed mesh seat (like on the C300 or S300) offers more consistent comfort and hygiene.

What if the chair isn't comfortable after you've bought it?

Don't ignore discomfort. While high-quality chairs may take a few days to get used to, persistent issues usually stem from poor adjustment — not the chair itself. Check your seat height, lumbar positioning, and desk setup first. That said, always purchase from a retailer offering a fair returns policy, just in case.

How do I know if a chair is a good fit for my body?

A proper fit should include:

• Feet flat on the floor
• Knees at a 90° angle
• Complete lumbar contact with no gap
• Elbows in line with your desk surface when using armrests

If you're shorter than 5'5" or taller than 6'2", pay close attention to the chair's seat height and depth ranges. For example, the S300 is more suitable for taller users.

Final Thoughts

If you've made it this far, it's likely your current chair isn't doing your body any favours. Whether it's a dull ache in your lower back, stiffness after meetings, or constantly shifting to get comfortable — these are signs your chair may be holding you back.

The reality is that a proper ergonomic chair isn't just about comfort; it's about how well it supports your posture, encourages natural movement, and reduces fatigue throughout the day. And not all chairs do this equally well.

From the smooth, gravity-defying recline of the S300, to the balanced, adaptive support of the C300, or the essential ergonomic basics offered by the M57, Sihoo's range delivers options suited to different working styles and budgets.

Ready to improve your workday?

• Think about your daily routine — how long do you sit for?
• Identify your pressure points — is it your lower back? Neck? Legs?
• Choose a chair based on what will genuinely make a difference, not just a long list of features.

With a well-designed Sihoo ergonomic chair, you'll feel the difference — not just in your posture, but in how you work each day.