I am sitting at my desk and whilst I am typing this, gently rocking in the RH Logic 300 with my feet firmly on the floor. RH chairs are known for providing one of the best free-floating rocking features and I can see why their two point principle that allow their chairs to rock is very popular. The Logic 400/300 series is an award winning range that provides comfort, style and ergonomic support in one package.

Four RH Logic 400 300 chairs with and without neck rests


Two point principle

RH build chairs around their signature two point principle:”Each chair has two unique points placed near the pivotal points on the body – the hips and knees. The chair follows your natural movements and your feet always remain on the floor 1 .” The torque is adjustable with a dial on the left and can be locked/unlocked with a dial on the right. It is not advised to lock the chair. The rocking mechanism is the pivotal selling point of this chair and disabling it is counter productive.

A chair that moves is something that took me all of ten seconds to get used to. It is marvelous. I am less tired, more alert, more comfortable and enjoy sitting in my chair. As someone who ordinarily loaths sitting up due to chronic pain and severe fatigue, this is quite an endorsement.

Super adjustable with a range of features

Ergonomic chairs are by nature highly adjustable and the Logic 400/300 is no exception. It has independent back angle adjustment and seat tilt adjustment (asynchronous mechanism), seat slide, height adjustment and optional extras include adjustable lumbar support, adjustable neck rest, height, width and depth adjustable armrests.

It is available in Standard, Comfort, Elegance and 24hr versions. The 400 has a high back and the 300 has a lower back to cater for different heights.

neckrestframeNeck support

The RH Logic 400-300 series comes with an optional neck rest. A headrest is a more common accessory. Headrests provide intermittent support when leaning back to rest, whereas a neck rest provides cervical support in all positions. The neck rest of the Logic 400/300 series is adjustable and very comfortable to use.

Comprehensive back support

The RH Logic 400/300 has an inflatable section that provide lumbar (lower back) support. Lower back support is essential for anyone with back, neck or spinal problems, but it is also vital in preventing back and neck problems from developing.

It also has a Tvedt cushion between the shoulder blades that encourages an open posture and felt very comfortable around my upper back. The curved shaped encourages a good upper body posture, including relaxed shoulder that allow for better breathing habits.

I felt that the support offered was excellent once I had adjusted the back rest to the correct height and inflated the cushion to the optimum level for me.

Active sitting

Sitting in the RH Logic 300 chair is a novel experience. The lumbar support and neck rest offer full back support and the rocking mechanism  makes it almost impossible to slump. Instead it encourages use of core muscles around the pelvis and hips to remain active, in place and in an upright position. It is hard work if you have always slumped in a chair, but there is a healthier solution than reverting to bad posture or a different chair.

Reclining the backrest provides a secondary position to sit in. In a reclined position muscles can relax more and it requires less effort to remain in a good position. I found myself varying between sitting in an upright position and reclining back to relax.

Do not be tempted to lock the rocking mechanism. I realised that locking the chair’s rocking mechanism makes it possible to slump and relax the pelvis without reclining, but the result was bad posture and inevitably pain at the end of the day, or sooner.

It is important to adjust the chair to your body. Sitting upright should be comfortable. If you sit on the chair and hold both arms side-ways at shoulder length and lift both feet, the chair should be balanced. If you tip forwards or backwards, adjust the backrest (middle button on the right side) until the chair does not move when you lift your feet up from the floor.

The Logic 400/300 series of chairs are made for full-time use and actively work towards supporting the body in a good sitting position. I felt that the ability to sit, move, rock over a two week period reduced pain, pressure and strain. It did take some getting use to and for the first day or two, it didn’t feel quite right, I was more tired and experienced some aches in muscles I was not accustomed to using. I knew my chair was ergonomic and correctly customized to my body, so I persevered and within a week these issues cleared up and I noticed a significant improvement.


Scandinavian Business Seating has a comprehensive environmental policy. All their products are manufactured based on their 5 principles of sustainability. The RH Logic 400/300 is constructed so that its components can be easily separated both for recycling (90% of its components are recyclable material) and to allow individual parts to be replaced, thereby prolonging the life of the chair.

The foam used contain no CFC or HCFC and the standard fabrics do not contain any flame retardant chemicals. It holds a Greenguard certification.

Three RH 300 chairs, white, black with neck rest and red


Capacity: 21 Stone – 133kg maximum user weight
Back height: 51cm Logic 300, 62cm Logic 400
Lumbar height: 16-23.5 cm Logic 300, 19.5 – 27cm Logic 400(measurement from top of seat)
Seat Depth: 40 -46 cm
Seat Height: 41 – 53 cm
Seat Width: 46.5 cm
XL Seat: Width 48.5 cm, depth 51.5cm and seat slide 6 cm is also available.
Height of armrest above seat: 21.5 – 29.5 cm
Distance between armrests: 37.5 – 50.5 cm
Diameter of base: 66 cm
Castors: Carpet (soft) flooring is standard, options for hard floors also available
Optional extras: Adjustable lumbar support, adjustable neck rest, height, width and depth adjustable armrests
Weight: 21 kg
Colour: A wide selection of colour is available
Textile: fabric, vinyl or leather
Optimised for right-handed users
Environments: Office, also in an ESD-approved and/or clean room compliant versions.
Warranty: 10 years for < 9 hours/day use, 5 years for > 9 hours/day use
More information: RH Logic 400/300



The RH Logic 400/300 series is a highly accessible range to anyone with a visual impairment, including blind users, photophobia or colour blindness. The controls are clearly labelled as well as easy to find and distinguish through touch. The chair has no lights or any other features that could be problematic for anyone with photophobia (light sensitivity).


It is highly accessible to anyone with a hearing impairment, including deaf users. The chair does not creak, squeak or click and operates silently, making it suitable for anyone with hyperacusis (sound sensitivity) who cannot tolerate noisy chairs.

Touch and movement

The RH 400/300 series is available in a range of fabrics, including textiles leather and vinyl. The standard textile fabric for my review unit was breathable and comfortable for long periods as long as I was wearing winter clothing. I have sensitive skin due to my medical condition as well as sensory issues and found that the fabric were on the rough side and even through a thin shirt I was uncomfortable and itchy. The neck rest rubbed against my skin and created a mildly irritated red area after a few hours. I would recommend requesting a different type of fabric to anyone with skin issues.

It is a good choice for anyone with some mobility issues. The chair tips forward with bodyweight, which makes it easier to stand up. It offers back support, arm support with arm rests, but no lateral support. The armpads swivel out of the way which makes transferring from a wheelchair easier, but they do require some force to move.

The range of chairs made by RH have many potential health benefits. Improved posture, movement and appropriate support can help address many common health issues, including chronic pain, fatigue, restless legs, sciatica, leg pain and circulation issues. I have POTS (postural orthostatic tachycardia syndrome) and find sitting upright very challenging, yet in the RH Logic 300 my symptoms improve.

RH Logic switchesControls

The controls are ergonomically shaped and well positioned, but favour right handed users. Most of the controls are to customize the chair on set-up or when sharing it, with a single exception of the switch that adjusts the back angle.

It is the only switch I used frequently throughout the day. The chair height, depth and angle is adjusted with three flat switches on the right that require moderate force to use. The buttons are large enough for two fingers.

Some finger, hand and wrist strength is required but it is just a push, grip strength is not a requirement. I had no difficulty using it.

The backrest is inflatable with a hand pump. It requires some force and grip to inflate. It is also slightly behind the chair.

There is a dial on the left and on the right. The dial on the right locks/unlocks the rocking mechanism and the dial on the left adjusts the torque.

Motion sickness and balance disorders

The rocking mechanism is smooth and I think it could be beneficial for motion sickness sufferers as the more we move, the more we get used to being in motion. I would advise caution for anyone with a significant balance disorder that is affected by movement. Set up and used correctly, there is no risk of tipping out of the chair or any uncontrolled movement. If sitting down or standing up feels insecure, I would recommend locking the rocking mechanism before sitting down or getting up.

Ease of Use

Choosing the correct accessories and setting up the chair on arrival is not difficult, but complex due to the large range of options available, however help is at hand. Check with the company you are buying from to see if they offer advice and will help set it up appropriately for you on delivery, many will. There are also on-line tutorials, videos, instructions and guides for those who prefer data over personal support and advice.

Once set-up, the chair controls are rarely used, except for the button that adjusts the back angle.

RH Logic 300 from the front, side and back


Chairs are by nature easy to use and once set-up, the Logic 400/300 chairs require no mental effort or skill to use. It is a chair that could potentially improve life quality for specific cognitive symptoms and neurological conditions. The rocking mechanism could be a great asset for anyone with ADHD who function better when moving and struggle to sit still in one position.

It also provides a way for those on the Autistic Spectrum Disorder or Asperger Syndrome who find rocking helpful to reap the benefit without drawing potentially unwanted attention. It’s silly, but rocking in a chair made to rock is socially acceptable whilst sitting cross legged on the office or classroom floor and rocking is not.

I have found that moving more and thereby increasing my circulation has also had some cognitive benefits. I find that my concentration, focus and organizational skills improve when I am alert and active. In addition, both my pain and fatigue levels have decreased which in turn has decreased their impact on cognitive functions.

I also feel more relaxed and view my desk and work environment more favourably.


The RH Logic 400/300 is made out of steel, aluminium, zinc, plastic and foam (polyurethane) and the covering is polyester or wool/polyamide. Sitting in the chair, my skin was in regular contact with the plastic on the armrests and buttons in particular and cover fabric. I would recommend that those with a skin condition or allergy select the most appropriate fabric that meet their requirements. A wide selection is on offer and there is even the option to choose your own, but be aware that in doing so the warranty would not extend to the fabric covering.

I have asthma and a dust mite allergy and did not experience any allergy symptoms whilst using the fabric covered chair. I did notice that sitting upright, particularly with Tvedt cushion supporting a more open chest, made it easier to breathe naturally which felt beneficial as an asthmatic prone to anxiety and hyperventilation.

Product Information


Scandinavian Business Seating owns the Scandinavian brands HÅG, RBM and RH, and has about 470 employees working together to realise the company’s vision: “To make the world a better place to sit!” More information about the company here.


£825+  (accessories, fabric and retailer affects the price)

Retailer: SB Seating retail through a network of dealers. Please contact [email protected] for information on your local dealer or a get a two week trial here

Included In The Box

  • RH Logic 300 chair
  • Optional extras: arm rests, neck rest, lumbar support

Logic 400-300 chairs around an office table


Most of us spend up to a third of our time sitting in our office chair despite the fact that our bodies are not designed for it. We sit in bad chairs with bad posture and complain when we go home tired and in pain. Scandinavian Business Seating is a company known for demanding high quality and providing excellence in an ethical, ergonomic and sustainable way. The Logic 400/300 is elegant, versatile, durable and adjusts to the perfect fit for almost any user.

It is a chair that provides solutions instead of creating problems. The RH Logic 400/300 is a perfect example of all the things a chair could be. Highly recommended.

This review is based on a RH Logic 300 Standard with neck rest, lumbar support and arm rests included, kindly provided by SBS.  To get a free two week trial of the RH Logic sign up here