Office Chair Extend M


This office chair is engineered for peak precision and performance. Your performance. Its intelligent design will optimise your posture and breathing, so you will always feel alert and preform at your best.

The Extend Office Chair is a high preforming office tool. Its intuitive design makes it the ideal choice for today's ever-changing workplace.

We stock Black. For any other colour options contact

This chair complies with all EN 1335 standards



Armrests - 4D Rotating...
€194.34incl VAT
Extend Neckrest Height and Depth...
€207.87incl VAT


€1,082.40incl VAT

Prices quoted are ex VAT



We stock this chair in Black.


In stock, goods will be dispatched from our ware house within 2-3 business days.  


Other colours have approximately a 2 week lead time.  We will email you with a delivery date nearer the time.


Box delivery with our courier.


Our experienced chair consultant will be in touch with you to ensure your chair is set up to suit your individual needs.


Returns policy.


In the event of receiving this chair damaged on delivery please let us know within 24 hours of receipt so that you can make a valid claim.


If you change you mind on purchase, please notify us within 14 day of purchase should you wish to return items.  You will need to ring for a Returns Note Number, which you will need to quote when returning items.   Goods must be unused, unopened, in a saleable condition and in their original packaging. 


If the item has been sent in error or is defective KOS will arrange collection and return.  Otherwise the onus is on the customer to arrange and pay for the return of the items.


Refunds will be issued on receipt of returned goods in saleable condition.



Extend Constant Back SupportThe Extend Office Chair is a high preforming office tool.  Its intuitive design makes it the ideal choice for today’s ever-changing workplace.

The movement of the chair is based on the principles of upright posture and active sitting.   This ensures that your body receives the variation and support it requires as you move.

The Extend M Office chair offers a backrest and seat angles that move simultaneously when you change your position.  As the chair’s basic settings do not change, this helps you to do more and perform better.

Extend Back Support in every sitting positionThe Extend chair is also available in other models, with a larger back rests and with a back angle adjustment.

The backrest on the Extend M is equipped with a ”Tvedts” cushion, providing superb support for the whole upper body.  The shape of the backrest encourages movement and the height is adjusted with the simple push of a button.

The controls for the height and depth of the seat are all conveniently located on the right-hand side of the chair.  The correct height improves blood flow in the legs while the correct seat depth provides greater comfort and support.  The tilt mechanism is infinitely adjustable, with a smooth action that can be locked in any chosen position.

Dynamic seating means the chair follows your every movement regardless of working position providing complete support, enabling you to always sit correctly and breathe properly.

Extend Complet Back supportThe seat provides excellent support and has a waterfall edge to reduce pressure on the underside of the thighs, aiding circulation.  It is also designed to keep you positioned in the middle of the seat, even when it is inclined forward.

The resistance of the tilt mechanism is simply adjusted according to body weight and height. This allows this office chair to follow your movements without the need to exert muscular force to push the chair into new positions.

Armrests are optional but are recommended since they provide relief for the shoulders.  They are adjustable in width and depth with a rotating function.

Extend M Office Chair Specification;Extend Armrests Rotating

Suitable for individuals
up to 133kg
between 5' 4 - 6' approximately

Backrest incl. lumbar pump: width 440 mm, height 510 mm

width 460 mm, depth 470 mm (seatslide 60 mm)

Seat height
: 400–510 mm (4Q)

in grey lacquered aluminium (5X) and castors for carpeted floors (65 mm)

Optional Armrests
: Adjustable in height and width. Rotating. Armrest height above seat 215–295 mmExtend neckrest

Optional Neckrest
: Height and depth adjustable.  (Make sure to take account of the back rest height when deciding on a neckrest)

We stock black. 

Delivery time on Gaja  colours other than black is approx 10 days. 
This chair complies with al EN 1335 standards.
Great buy.
Noah S. on 15/08/2016 Great little chair
Annette Shannahan - Owner ..

We at Abbey Physio and HealthcareDirect have worked very effectively and on many occasions with Seamus and the team at Kos Ergonomics when seeking solutions and resolving work-related...

Eileen Murphy - Physiotherapist ..

I recommend patients to KOS. They have experience and expertise with ergonomic solutions for patients with particular problems. When they sell a chair, they ensure that the chair is fitted...

Padraic O'Fiynn - Ergonomist ..

Since 2006, working as a chartered ergonomist with KOS Ergonomic solutions has greatly contributed to an early and safe return to work mainly for staff and where necessary students of the...

Kathleen Treanor - Ergonomist ..

I Kathleen Treanor have worked collaboratively with KOS and Seamus Kennedy since 2000. We have worked together with many organisations both public and private, to provide professional...

Sarah Carry - UCD ..

Since first contacting KOS Ergonomic Solutions in 2010, l have found their service reliable and efficient, combining excellent customer service and product expertise with a range of ergonomic...

Eileen Hannon - Stryker ..

KOS Ergonomic Solutions has supplied us with chairs for our Beading Room which have been very beneficial to the safety and comfort of our employees working in this area. These chairs are used 14-18...

Alison Minter - Paypal ..

Just wanted to say thank you for the quick and efficient service over the last year. It’s been a pleasure dealing with you and I would highly recommend KOS to anyone

Irene O'B - Physio & Ergonomist ..

Following a fall from a bicycle I sustained a T10 (mid back) wedge fracture with no nerve damage. I also reinjured my neck having sustained a whiplash injury some 20 years previously. Three months...

Karol Fitzgerald - Athlone IT ..

As I informed you previously to my numerous back problems, resulting from fracturing a couple of vertebra in my lower back a number of years ago. This later caused disc to slip, trapping nerves...


KOS Ergonomics Ireland

Since 1991, we have been working with companies and individuals as the leading provider of ergonomic office furniture in Ireland.

We currently provide a full ergonomic service from office to home with our ergonomic homeworker packages, sit stand desks , ergonomic chairs , remote assessments and KOS Ergonomic program management software.

Discover our wide range by booking a showroom consultation or by shopping online!

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We can provide you with a VDU Assessments when you visit our showrooms in Dublin or in Holycross in Tipperary.

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