Invictus PI 4000 | Back Care Office Chair | Posture-Improving Chair
1
The Back Care Office Chair That Works!
Still in Pain After Trying Other “Ergonomic” Chairs?
Have you’ve cycled through chair after chair, each claiming to be ergonomic, only to end up sore, fatigued, and frustrated then you’re not alone.
The Invictus PI 4000, the posture-improving chair engineered by KOS Ergonomics to do what other office chairs can’t, support your spine, relieve pain, and promote real, long lasting comfort.
This chair is a clinically-informed seating solution—purpose-built for people who spend long hours sitting and need serious back support.
What Makes the Invictus PI 4000 Different?
Proven Relief for Real Back Pain
The Invictus PI 4000 was developed by ergonomic experts with decades of experience in occupational health. Its unique back care design actively works to relieve lower back strain, improve posture, and reduce muscular fatigue throughout the day.
Adaptive Support That Moves With You
Your body isn’t static, your chair shouldn’t be either. The Invictus PI 4000 features:
-
Pneumatic lumbar support for precision lower back alignment
-
4D armrests that adjust in every direction
-
Fully adjustable headrest, backrest, and seat height
-
Seat depth adjustment for tailored thigh support
Every element is designed to adapt to your body, not force your body to adapt to the chair.
Sit Longer. Feel Better
The seat is built from PU-moulded foam, offering gentle pressure relief and weight distribution that lets you stay focused and productive without the nagging pain.
Built to Last
With a solid aluminium base and premium materials throughout, this is a chair you can rely on. It’s sturdy and dependable but never rigid. You’ll feel the support, not the strain.
Eliminate the Usual Chair Frustrations
If you’ve struggled with:
- Persistent back pain
- Poor posture and slouching
- Fatigue or discomfort after just a few hours
- Lack of adjustability
- Chairs that wear out far too quickly
The Invictus PI 4000 was built specifically to solve those problems. No compromises, no shortcuts, just real support that lasts.
Trusted by Professionals. Designed by Experts
Whether you're working from home or in a high-demand office environment, this is the chair chosen by those who take their spinal health seriously. Endorsed by occupational therapists and posture specialists, and certified to meet European ergonomic standards (EN 1335-1 & EN 1335-2) You’re not just buying a chair, you’re investing in your health.
Work Comfortably. Sit with Confidence
You weren’t meant to suffer through your workday. The Invictus PI 4000 gives you the support you need to stay focused, comfortable, and pain-free, no matter how long you sit.
Experience What True Ergonomic Support Feels Like
The Invictus PI 4000 is available exclusively from KOS Ergonomics.
You won’t find this level of care and engineering anywhere else.
Ready to stop settling for less?
Make the switch. Your back will thank you.
👉 Try the Invictus PI 4000 today — online or in-store.
Try It for Yourself
Don’t settle for discomfort—experience the difference with the Invictus PI 4000 ergonomic chair.
Visit us to try it in person or order online today for a healthier way to sit!
Try In Tipperary Try In Dublin
Posture Tips & Improved Ergonomics
Sitting for long periods can often lead to discomfort or pain, especially in areas like your hips, lower back, and tailbone. Here are some simple, effective tips to help improve your posture and reduce common issues like hip pain when sitting, lower back pain when sitting, and tailbone pain when sitting.
1. Support Your Lower Back
If your lower back hurts when sitting, it's often due to a lack of proper support. Make sure your chair has good lumbar support to keep your spine aligned. You can also use a small cushion to provide extra support if needed.
2. Keep Your Hips at the Right Angle
When your hip hurts when sitting, it may be due to poor alignment. Your hips should be level with or slightly higher than your knees. Adjust your chair height so your feet are flat on the ground and your knees form a 90-degree angle. This can help reduce hip joint pain while sitting and prevent buttock pain when sitting and lying down.
3. Adjust Your Seat Position
For those dealing with coccyx pain when sitting or a sore tailbone from sitting, ensure your seat isn’t pressing too hard on your tailbone. Try a cushion with a cut-out section to relieve pressure on the tailbone and improve comfort.
4. Move Regularly
If you feel buttock ache when sitting or hip discomfort when sitting, it's a sign that your body needs a break. Stand up, stretch, or take a short walk every 30-60 minutes. Regular movement can ease tension and prevent hip ache when sitting or lower back pain while sitting.
5. Exercise for Strength and Flexibility
A good workout for back pain can strengthen your core and back muscles, reducing discomfort. Exercises like gentle stretches or yoga can help relieve bottom pain when sitting, butt pain while sitting, and improve overall posture.
By following these posture tips and incorporating ergonomic tips into your daily routine, you can reduce discomfort and improve your overall well-being while sitting. Make sure to listen to your body and adjust your workspace as needed to stay comfortable throughout the day.
Download Your FREE Posture Watch Poster!
Get Serious About Your Posture With This Helpful, Free Reminder!
Alternative Products
Malmstolen 4000 | Back Care Office Chair
Recommended Add-Ons
ErgoSync Wireless Keyboard And Mouse Set
Ergo Adapt | Bestselling Laptop Stand
PI Float Dual Monitor Arm Black
Find Your Perfect Solution To Pain-Free Work.
Expert Advice
Our experts are highly trained and experienced in providing tailored solutions for back pain sufferers.
Get in touch with one of our Experts and they will be happy to offer simple guidance on what you should be looking for in an Ergonomic Product!
Visit A Showroom
Try out all of our Back Care Ergonomic Chairs in one of our 2 Showrooms. You have the option of Tipperary or Dublin.
Please note, our showrooms are by appointment only.
This is down to the fact that we always offer our full, undivided attention to every customer. You will meet an Ergo Expert in person, who will recreate your work set up and offer advice on the best office chair for your situation.
Purchase Online
If you know what Ergonomic Product you want, you can easily purchase online, or request an official quote!
To request a quote, simply add the product to your basket and "Request A Quote".
You can also request a quote from our dedicated Customer Support team!
To install this Web App in your iPhone/iPad press 
and then Add to Home Screen.
