Ergonomic Office Chair for Coccyx Pain HM380C


This complete back care chair has a specially designed seat with a coccyx cut out to ensure you avoid putting pressure on your tail bone.

This back care office chair provides complete back support chair to relieve and prevent back pain.

Complete with Adjustable Arms and Neckrest.

This chair complies with al 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.

Select Fabric Swatch.

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


€1,954.47incl VAT

Prices quoted are ex VAT

Back Chair balans position your spine is in its natural S shapeThe coccyx seat on the HM380C Ergonomic Office Chair is completely covered with material so that the coccyx cutout is not noticed.   

Yet the user get full benefit as there is no pressure on their tail bone from the seat.



HM380 ergonomic office chair give freedom of movement.

It allow 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.

Excellent Back Support when sitting

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



HM380 back chair is adapted 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 out


HM380 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 HM380C Ergonomic office chair you will notice a difference immediately and will be able to relax without pressure on your tailbone. 



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.

HM380C Ergonomic Office Chair for Coccyx Pain Specification

Suitable for individuals


up to 150kg


between 5' 4" - 6" 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.


I can sit comfortably again!
Oisin K. on 22/09/2017 I haven't been comfortable in a chair for years! Why didn't I come to you earlier! Thanks James
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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