Back Chair for the Office HM380


Best office chair for your back - a great chair for those with back pain.

The HM 380 is orthopedically designed chair. The backrest is designed to provide optimum support to the crucial areas and has a lumbar pump to give an exact match.

One of the key features is the forward tilt seat pan function that allows the user to safely sit forward on the seat without support, while putting the spine into a more neutral position, by rotating the pelvis and taking the pressure off the spinal discs (same principle as a kneeling chair). This removes the most frequent risk of sitting unsupported in the slouched position, which if doing so for prolonged periods can be detrimental to the spine.

Chair comes complete with Adjustable Armrests and Adjustable Neck rest.

This chair complies with all EN 1335 standards

Note: We stock Black. For any colour other than the standard black there is an additional charge of 150,00 + vat as these are non stock items. The lead time of 8-10 weeks. Please contact for more information.


€1,757.67incl VAT

Prices quoted are ex VAT

Back Chair balans position your spine is in its natural S shapeHM380 office chair gives freedom of movement.

It allows the user to stretch out their body while sitting.

The pivot axles tilt the seat pan forward at the same time as the backrest tilts backward.

This gives the user a comfortable position that gives your spine the full support it needs.

This is made possible by the HM Mechanism which uses three independently moving pivot axles—the seat pan, the rocker action and the backrest.


Excellent Back Support when sittingHM380 back chair adapt to suit the user.

The height and depth of the seat pan and the armrests are all adjustable, giving the user comfort and good support while working.

The rocker mechanism is also adjustable so the backrest gives support without feeling like the chair is rocking backwards or stiff.

The height of the seat pan can be raised to a level where you can comfortably sit with a straight back.

Excellent Lumbar support while stretched outHM380 ergonomic chair improves breathing and blood circulation.

The HM line allows you to sit stretched out while reclining, with full support for your spine and without your feet· being lifted off the ground.

This way you open your body and facilitate breathing and blood circulation.

When you sit in the HM380 chair you will notice a difference.  And how nice and relaxing it is to sit properly!


The HM380 office chair is the complete back support chair to relieve and prevent back pain.

Having the right chair at work is a smart investment that keeps users healthy, lowers absenteeism due to illness and helps us to sit comfortably and do a better job.

This ergonomic chair offers unrestricted movement when sitting, which means the user can sit upright, stretched out, poised or reclining without touching a single lever.

This makes the HM380 office chair ideal for people who split their time between the computer, desk and telephone.  The HM380 comes as standard with an adjustable lumbar support with a lumbar pump for complete individual fit.



Suitable for individuals


up to 150kg


between 5' 4" - 6' 2" approximately


Seat Depth: 470mm

Seat Width: 430mm

Seat Height: 410 -560mm

Back Rest: H 540·· W410mm

Base: black base in aluminium.

Castors with a rubber thread

Rotating Armrests: have an adjustable height 170-290mm and width 390-500mm.· Adjustable depth to the fron of the seat 140-230mm.· Swivels 40 degrees.

Standard neckrest: adjustable 120mm in height and 50mm in width.

We stock black, other colours have a 4 week lead time.

We stock Black. For any other colour options contact
Note: For any colour other than the standard black there is an additional charge of 140,00 + vat as these are non stock items.

"Listen to your body, remember prevention is better than cure."


All good and delighted with the chair




Thanks you. The chair  is excellent and the other items are also very good. I have it setup as advised by Seamus and after reviewing the instructions.  I would like to thank Seamus for the kind instruction and for delivering the chair promptly.

The plan will be to purchase more ergonomic chairs and other items for an office as the business develops.

Many thanks for your assistance.

Kind regards,




Thanks Seamus for your help in choosing my chair. Am happy with all.


A very happy Christmas and new year to you and yours.






Hi Seamus

"I would like to say that your chairs are amazing – great comfort!"

Anne P





"Also I must say my chair is fabulous, I would be lost without it!"

Alison P






Many thanks James,


"I am very happy with my new chair, thanks again James"


Kind Regards





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 4 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.

Filter reviews

it has improved my posture no end. Also the "kneeling chair" feature is great. Really helps when sitting for long periods.
Shane K. on 13/06/2020 Chair fully supports my spine
I've been to 5 office furniture stores trying chairs and the main difference with KOS is they have ergonomics people there to advise you based on your medical issues. The service was top notch. I was worried with the cost but when they said they'd give me 30 days free returns, it was great.
Mark A. on 19/07/2020 Best office chair if you have back pain
The chair is unreal. It has made such a difference to my back pain. My consultant recommended KOS and I have to agree with them. It's not just the chair, it's the whole service from when I went into the showroom to when they set me up on the chair. The only down side is I had to wait 6 weeks because I wanted a different fabric.
Ryan K. on 21/12/2020 Full support on my spine
Even with the Covid-19 restrictions, I felt I got a very personal service from KOS. The chair is perfect. Gives me support in all the right areas and I never would have believed how much I love the recline. It just takes the pressue of my spine
Peter M. on 25/05/2021 Great experience with KOS and class 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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