KOS Sit Stand Chair

CH HM Sit Stand E55


Helping to reduce back pain and improve posture while working at your computer.

The perfect sit stand chair for the sit stand desk, for those who wish to change their seating position from sitting to a half standing position.

Offers excellent back support when sitting and adjusts into a saddle seat for the half standing position.

Click here to try out the chair or book a free ergonomic consultation

Colour Black


tax excl.

Prices quoted are ex VAT



We stock this chair in Black.


In stock items will be dispatched within 24hrs. Please allow 2-4 days for delivery.  


If not in stock, lead time is approximately 4/5 weeks.  We will contact you with a delivery date nearer the time.


Box delivery with our courier.


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

KOS Sit Stand Chair prevent back pain Perfect chair for Sit Stand Desk


The KOS Sit Stand Chair was designed for the computer user enabling them to change their seating position from sitting at a standard desk to a half standing position at the higher height.  Half standing has all the advantages of standing, but also takes the pressure off the feet and legs. 



Improving posture while offering support


This sit stand office chair 
is equipped with an advanced chair mechanism that has three balance axles, ensuring that the chair moves in harmony with the body providing optimal support at all times.  


KOS Sit Stand Chair improves postureIt has a balance cushion inserted in the front edge of the seat. This cushion is not noticeable when you use the chair normally, but it prevents you from sliding off when the chair height is raised and the seat is tilted forward.  


You can easily find your own individual half standing position that is comfortable for you.  The height is right when the pelvis is rotated forward and you feels a straight, balanced spinal posture.


The back angle can be adjusted to provide the correct support for you, with a lumbar pump to complete the individual support.




Suitable for users approx:


up to 150kg


between 5' 2" - 5' 11" approximately


Seat size: 400 x 460mm


Seat Height:  w410 - d560mm


Backrest Size: w400 x H550mm


Lumbar Pump


Back Height Adjustment



Back Angle Adjustment can be locked


Seat Depth Adjustment


Weight Adjustment


Adjustable Armrests:  width, depth and height adjustable.


Adjustable Neckrest




Higher Gas Stem:  450 - 670mm

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...


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