Office Chair for Coccyx Problem Logic 400C


The Coccyx Cut out office chair is fitted with a seat that has a coccyx cut-out to help avoid any direct pressure on the coccyx. It aids the coccyx sufferer to sit back into the chair, so you get full support from the back rest and lumbar support.

An excellent office chair with a seat that has a coccyx cut-out to help avoid any direct pressure on the coccyx.

This chair complies with all EN 1335 standards



Armrests - 4D Rotating...
€194.34incl VAT
Neckrest - Height & Angle...
€116.85incl VAT


€1,813.02incl VAT

Prices quoted are ex VAT

Constant Back Support
An excellent office chair with a seat that has a coccyx cut-out to help avoid any direct pressure on the coccyx.

It is a complete back care chair that will ensure comfort and support for your whole back as you work.

The Coccyx Cutout Chair can be adapted to suit every person, taking into account their height and weight so that the correct loading is placed on the body.

The degree of neck support and lumbar support needed is also taken into account, resulting in a chair that fits you that follows the smallest movement and gives you full strain relief, support and comfort.  

Complete Back Support in all working positions.The back is fully supported in every sitting position. You will notice the effect as soon as you sit down.

First of all, the vertical movement of the front of the seat is minimal when leaning backward or forward. Your feet always remain in contact with the floor, minimising the pressure against the underside of your thighs, which eliminates numbness due to restricted blood circulation.

Secondly, the backrest height remains constant, regardless of the seat angle. Consequently the lumbar support is always in the correct position, which helps facilitate an upright posture and more importantly the lumbar support remains in the correct position, regardless of your movements.  Your next position is your best position 

Logic 400 Back Care Chair Specification;


Suitable for individuals


up to 150kg


between 5' 4" - 6' 4" approximately

Extend Armrests Rotating

Backrest incl. lumbar pump: width 440 mm, height 620 mm

Seat: width 465 mm, depth 475 mm (seatslide 60 mm)

Seat height: 410–530 mm (4Q)

Base in graphite aluminium (5X) and castors for carpeted floors (65 mm)

Optional Armrests: Adjustable in height and width. Rotating. Armrest height above seat 215–295 mmLogic Neckrest from KOS

Optional Neckrest: Height and depth adjustable

We stock black, other colours have a 4/5 week lead time.



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 4/5 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.

Logic 400 Instructions

Takes the pressure off tailbone and great back support
Adam H. on 03/03/2017 I was in a car accident. I've been suffering with back pain since broke my tailbone too. I haven't sat on a chair properly since the accident. With this chair I can sit with no discomfort. I can't say how much difference this has made to me
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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