Invictus PI 4000 | Back Care Office Chair
1
The Invictus PI 4000 is the posture improving chair designed by KOS Ergonomics to support your spine, relieve pain, and promote real, long lasting comfort
Why Choose The Invictus PI 4000?
Developed by ergonomic specialists with decades of experience in occupational health, the Invictus PI 4000 offers scientifically grounded support where you need it most.
Its adaptive back care system is designed to relieve lower back strain, improve spinal alignment, and reduce muscular fatigue, helping you stay comfortable and focused throughout the day.
Your body moves, your chair should too
The Invictus PI 4000 features a rocking mechanism with tension adjustment, allowing for natural movement and postural variation throughout the day. You can lock or unlock the rocking function to suit your preference, ensuring your chair always moves in harmony with you.
Every element is built for personalization, including:
- Pneumatic lumbar pump for precise lower back alignment
- 4D adjustable armrests that move in every direction
- Adjustable backrest and headrest to match your height and posture
- Seat height and depth adjustment for tailored thigh support
- Rocking tension control and lock for active sitting comfort
Sit Longer. Work Better. Feel Supported
The PU-moulded foam seat evenly distributes weight to reduce pressure points, keeping you comfortable during long periods of sitting. Whether you’re working from home or in a busy office, you’ll experience comfort that lasts all day — without the stiffness or fatigue that comes from standard chairs.
Built to Endure
Constructed with a solid aluminium base and premium-grade materials, the Invictus PI 4000 is engineered for strength and stability. This is a chair that won’t wear out quickly, a long-term investment in your wellbeing, not another short-term fix.
Designed to Solve the Common Chair Struggles
If you’ve dealt with:
- Persistent lower back pain
- Poor posture and slouching
- Discomfort after only a few hours of sitting
- Limited adjustability
- Cheap materials that don’t last
The Invictus PI 4000 is your solution, built to eliminate these frustrations with thoughtful, ergonomic engineering and lasting quality.
Certified Comfort. Trusted Quality
Backed by European ergonomic standards (EN 1335-1 & EN 1335-2), the Invictus PI 4000 meets strict requirements for both safety and comfort.
It’s also the preferred choice of occupational therapists and posture specialists, trusted by professionals who understand spinal health.
Affordable Excellence in Ergonomic Design
Unlike many high-end ergonomic chairs, the Invictus PI 4000 offers exceptional support and adjustability at a more affordable price. It’s proof that premium comfort and real back care don’t have to come with a premium price tag.
Experience the Difference
Available exclusively from KOS Ergonomics.
Don’t settle for discomfort , choose real ergonomic support.
👉 Try the Invictus PI 4000 today — online or in-store.
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
Frequently Asked Questions
A: This is an online ergonomic training course designed to teach participants how to assess Visual Display Units (VDU) / Display Screen Equipment (DSE) safely and in compliance with Irish and European health & safety regulations. It covers workstation assessments, ergonomics, and MSD prevention.
A: This course is suitable for anyone responsible for workplace safety or office ergonomics, including:
-
Health & Safety managers or consultants
-
Health & Safety representatives
-
Occupational health professionals
-
Facilities management staff
-
Architects involved in office design
-
Office managers and business owners
A: No. This beginner-friendly online DSE/VDU course is suitable for anyone, regardless of prior ergonomics or health & safety experience.
A: The course is fully online via Microsoft Teams, featuring interactive lectures, group exercises, explainer videos, polls, and practical workstation assessments.
A: The course runs for 1 full day (9am–5pm) with breaks.
A: The course is delivered by highly experienced ergonomic and health & safety professionals from KOS Ergonomics, who work with leading Irish companies to reduce workplace risks and improve office ergonomics.
A: Yes. Participants who successfully complete the theory exam and practical assessment will receive a KOS Training Academy Level 1 VDU / DSE Assessor Certificate.
A: You’ll need a computer or tablet with a camera, microphone, and stable internet connection. A typical home or office workstation is sufficient for the practical exercises.
A: Key topics include:
-
Ergonomics and anthropometrics for office work
-
Hazards and risks associated with VDU/DSE use
-
Legal requirements under Irish and EU legislation
-
Workstation setup, environmental factors, and emerging trends (hot-desking, sit-stand desks, home working, laptop/tablet use)
-
Practical assessment and evaluation techniques
A: Yes. The course covers Regulation 72 of the 2007 Safety, Health & Welfare at Work Regulations, along with European Directive 90/270/EEC to ensure compliance for all EU countries.
A: Absolutely. By training staff as certified VDU / DSE assessors, your organisation can reduce musculoskeletal disorders (MSDs), improve employee wellbeing, and ensure compliance with legal obligations.
A: Yes. Participants have access to KOS Ergonomics’ expert advice and resources for any follow-up questions related to workstation assessments or ergonomics.
To install this Web App in your iPhone/iPad press 
and then Add to Home Screen.
