Koshi Cushion | A new way to help prevent back pain

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Back pain is extremely common in Japan, due to long working hours at stationary jobs. One big part of this is that many people have poor posture, which creates problems. All that tension, stress on the back builds up and your body just can’t take it. That’s why we have come up with a new type of back support to help combat this problem! We created the “Koshi Cushion” in order to help those that have to stay home and shelter, and are spending long hours in front of a screen.

Product Options プロダクトオプションズ
Product Options プロダクトオプションズ

2020.11.25

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Back pain is extremely common in Japan, due to long working hours at stationary jobs. One big part of this is that many people have poor posture, which creates problems. All that tension, stress on the back builds up and your body just can’t take it. That’s why we have come up with a new type of back support to help combat this problem! We created the “Koshi Cushion” in order to help those that have to stay home and shelter, and are spending long hours in front of a screen.

Product Options プロダクトオプションズ
Product Options プロダクトオプションズ

2020.11.25

Back pain is extremely common in Japan, due to long working hours at stationary jobs. One big part of this is that many people have poor posture, which creates problems.

With the change from working in the office to working at home due to the coronavirus epidemic, and with this, the lack of leaving the house for meetings, people have been sitting even longer than normal.

All that tension and stress on the back builds up and your body just can’t take it.

That’s why we have come up with a new type of back support to help combat this problem!

We created the “Koshi Cushion” in order to help those that have to stay home and shelter, and are spending long hours in front of a screen. Koshi or 腰 in Japanese, means lower back, and this is something that we think can help cushion and support your whole lower back, letting you live a more active and fun filled life!

By attaching the Koshi Cushion to the chair, the support works by cushioning your back and putting it into a correcting position, helping you to both maintain correct posture and also to help take the strain off your back muscles and spine.

Koshi Cushion is made different to other back support products, using 4 main springs to help support the back, and allowing you to adjust the height of the supporters. This allows you to dynamically support your back to the right standard.

Most conventional supports don’t help when you shift your weight around, but due to the way we've created the Koshi Cushion it works when you move. This means that it follows and supports your back in any and every way.

The panels used to support your back are also adjustable in height, meaning that you can change it depending on the chair you use!

Until now, we have focused on a Japanese market, and in doing so our production has been looking to support a variety of Japanese body types. In order to accommodate for different body types in the west, we're looking into making the support even tougher, allowing for the support to handle a larger load, so that anyone can use the Koshi Cushion and feel their back pain just melt away! 


As we mentioned previously, we have incorporated 4 springs into the panels that allow for the support to move to your body, correcting your posture as you move.

Two springs on either side allows for a whole range of motion, both up and down, and inwards and outwards. This allows for a whole range of body types to be supported.

It is difficult for people to sit in the same position for a long time, and they are constantly moving, affecting their posture.

Static, non-adjustable back supports therefore aren’t able to keep up with this constant movement. We wanted to make this dynamic movement a big development point of this product!

We had tried a variety of back supports, and this one works the best to solve the problem by dynamically adjusting to you.

The Koshi Cushion can be used of course in an office setting, but it can also be used on mostly any other chairs that you can think of (as long as it’s a single sitting chair if you want to have the maximum support).

With remote work has increased recently, many people don’t have chairs that they would normally use in the office, but with this product you don’t have to worry as it can be used with a wide variety of chairs found in the common home.


Many conventional back support systems don’t fit various chairs or fit everyone’s body type.

We wanted to be able to help as many people as we could, so we created a design meaning that you could change the height of the supports, so you can adjust the size in order to make it usable with any type of chair.

You only need to use the button to change the height of the supports with a maximum difference of 8.4cm between the highest and lowest points.

▲5 different levels to choose from▲
▲The difference between the lowest and highest points▲
▲Showing the lowest setting▲
▲Showing the highest setting▲

※People between 120cm~ 190cm are best suited to this Support

※The support can hold up to about 80kg, so as long as the upper body of the person doesn’t exceed this it will work fine.

The Koshi Cushion is extremely durable, and apart from the cushions, you can wash it with water. 

Polyurethane can be used about 50,000 but this support has been made to withstand it being used 100,000 times due to work in cooperation with the moving parts.

※The above shows everything that can be washed. You can also using rubbing alcohol and/or disinfectant. 

I came up with the Koshi Cushion due to having back pain from sitting too long at the office.

When we started looking into development, we started working with developers that have had about 10 years of experience in the massage industry. Their main aim is to create products that help reduce the stress and burden on office workers’ bodies.

However we realised that we would need to make something that works while the user is sitting, so we looked at making a preventative support rather than helping to heal already bad backs.

With that in mind, we looked at various chairs, supports, and pads, but it was hard to find something that really appealed to everyone.

In regards to chairs like those that gamers use, they are extremely expensive, and many people can’t afford them.

So we coordinated and came up with a product that can be attached to a chair that is both inexpensive and highly effective. We then worked towards repeated improvements and our final product ended up being the Koshi Cushion.

You can see how the spine is made to fit properly when using the Koshi Cushion.

Using the Koshi Cushion is extremely easy. First we place the support on the chair and use the straps to secure it in place.

After fixing it in place, adjust the height so that it is allows you to keep a good posture as well as being comfortable to sit in.

The support should be allowing you to use it so that it fits your back snuggly and helps you keep a good posture.

The cushion attachments are easy to attach and take off
You can wash Koshi Cushion with water after taking the cushioning attachments off.

Other than the strap, everything is fine to wash with water.

You can also disinfect it with alcohol wipes.


Functions: Height adjustable using button (extends up to 8.4 cm)

Except for the attachment (polyurethane (foam) backrest), it can be washed with water and kept clean.

Foam backrest can be removed when it is hot to allow for more ventilation to the back.


※Subject to exchange rates

Product Options Co. LTD. is a company that looks to create and develop health and beauty appliances that are both effective and inexpensive, hoping to improve the health of people all around the world at a low cost. 

This Project is promoted by Japankuru Funding, Bringing Japanese Products to the West!

Risks and challenges

While the product design is complete we may face problems when it comes to actual manufacturing, and delivery. We ask for your understanding in this case. Shipping may be delayed if the number of orders exceeds expectations. We don’t accept returns or requests for refunds due to usability. If we are able to move to mass production levels, please be aware that the retail price of the product may decrease to less than what you backed at. There may be products that are similar to this product available on e-commerce sites. Due to the nature of crowdfunding, this is sometimes inevitable. We ask for your support in this case. Due to natural disasters or other unexpected problems, deliver may be delayed. If this happens we will let everyone know, and share as much information about what we are doing to solve the problems.

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This is an All or Nothing project. This project will be funded if the amount of money raised exceeds its target amount.

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Product Options プロダクトオプションズ
Product Options プロダクトオプションズ

Product Options Co. LTD. is a company that looks to create and develop health and beauty appliances that are both effective and inexpensive, hoping to improve the health of people all around the world at a low cost.

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