Hare hare Tumbler | A sustainable tumbler that never breaks!

Funded 347.5%
  • Funded 347,519yen (About $3266.6786) (About $0) The target amount is $940 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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Made in Japan using ingenuity mixed with sustainable materials, the Hare hare Tumbler is a tumbler that is both bendy and unbreakable!

Warmth Co.

2021.3.22

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Made in Japan using ingenuity mixed with sustainable materials, the Hare hare Tumbler is a tumbler that is both bendy and unbreakable!

Warmth Co.

2021.3.22

 Due to the special material it’s made out of making it soft, even if you bend or squeeze the tumbler, it will always bounce back to normal!

With a refractive index higher than that of some glass used in precision lenses and sensors, and an extremely high transparency, this unbreakable tumbler shines brilliantly in the light.

Made from bioplastic to help impact the environment in a positive way! 

When we first created the Hare hare Tumbler, we first started with a purely clear version of the Tumbler. 

But for this project, we have created 4 new tumblers! By adding a special colouring during the process for creating the Hare hare Tumbler, we have been able to make 4 different coloured tumblers! These colours are Red, Blue, Green, and Purple! 

We hope that you take us up on these exclusive offer! 


Creating goods that are kind to the environment and spreading them across the world.

That’s our mission at Warmth Co.,Ltd .



『Hare hare』is a brand that looks to promote the amazing qualities of soft but highly see-through biomass resin material.

Biomass is a material that is created while taking into consideration the environment, either through recycling or by using reusable materials. 

The biomass used in the Hare hare Tumbler is completely safe for use with food and drink. 

What’s more in the event of disposable, it doesn’t contain any material that may become toxic, meaning that it is safe for the environment. 

In recent years, the problem of waste and rubbish has become widespread all over the world, but with the Hare hare Tumbler, we look to help the world take a step in the right direction.

This product is made in Japan, and new to the world! 

We hope that this can be both a tumbler that is something that can both help the environment and help reduce environmental damage while also being something that you can use everyday. 



The Hare hare Tumbler is not just unique because of its material.

We look to also combine this sustainable material with a high practicality with a beautiful outward appearance.


When you think of various plastic tumblers and items, there arises many problems, such as easy to be stained by food and drink, easy to collect dust, and weak to heat (in some cases even melting) but the Hare hare material passes all these tests!

The Hare hare Tumbler is made from material that is soft, which means if you squeeze it, it just bounces back. 

What this also means that even if you drop it it is able to absorb the shock and still be fine, which even supposed “unbreakable” tumblers sometimes fails at. 

(That’s not to say that if excessive force is used, then there may be changes to the shape of damage to the tumbler.)

Because the material used has a low thermal conductivity, it means that it is slow for the heat to pass through and form condensation on the outside of the tumbler.


Even if you put ice in the tumbler, you won’t find moisture on the tumbler. You can use the tumbler for both hot and cold beverages, and not worry about the heat or cold affecting the softness of the tumbler. 

Because the tumbler is made to be insulating, the heat retention of the tumbler is also quite high. 

You can enjoy a hot coffee or tea using the tumbler. 

What's more, the tumbler doesn't become hot even with these drinks.

 Because of its flexible properties the Hare hare Tumbler is great for small children as well as older folk that struggle to grip tumblers and are at risk of dropping them. However, the tumblers are also great for a high class bar scene, not looking out of place at all, and what’s great is that they are usable for a long time! 

Great for kids as well!


The Hare hare Tumbler when hit by light becomes like a crystal, shining and sparkling beautifully!

The refractive index of the Hare hare Tumbler is 1.509, meaning that it has a refractive index higher than that of some optical glass, with an extremely high degree of transparency as well. 

 This is done by moulding the highly transparent material in a specially made vacuum cast.


This material is made by mixing part carbon with part biodegradable liquid resin, and then heating it in a high vacuum state. In order to create this material, we had to create this process from scratch.

This means that material is a whole unique and new material, the first of its kind anywhere in the world. 

Through this process it means that the following are possible:

  • Hard to be stained or have its colour changed. 
  • Hard for dust to stick and hard to become dirty
  • Can be moulded at an environment lower than 60℃, with an infinite amount of uses.

Because of the beauty of its refractivity, not only does it work in the home, but as it has a glass like look, it would work well in bars and clubs.




The Hare hare Tumbler has been mentioned and featured on several TV shows as well as in magazines!

Featured in Mono Magazine 3-16

[Hare hare] is linked to the Japanese word Hare「晴れ」which means clear in a general sense but also is used to describe a formal congratulatory event such as wedding or birthday

In Japan, as with other countries, it is traditional to give a gift to the celebrator. 

We hope that with the Hare Hare Tumbler, you can pick it to give as a gift gladly and without hesitation. 

It is for this reason that we chose to not only make an item that is kind to the earth but is also beautiful and sparkly to look at. 


We recommend giving as a gift in a bright setting such as for weddings and birthdays.




Diameter at top: 85mm 

Diameter at bottom: 58mm 

Height: 85mm

Weight: 150g 

Volume: 190ml



April 2021 Project Start

May 2021 Project Ends

October 2021 Rewards Shipped


Warmth Co. ltd  Toyoki Kajiwara 梶原豊樹


We started with a goal in mind, creating a material that helps to reduce plastic waste around the world and that is kind to the environment. With the Hare hare Tumbler being made, and with 31% of it being biomass, we are extremely happy with our progress. 

To make this material we had to develop a whole new technology and machine. The Hare hare Tumbler has a variety of features. In order for these benefits to be known, we decided to start selling it. 

At Warmth Co. Ltd, our main business is the wholesale of spectacles at retail stores. We are looking at the creation of lenses and frames, as well as other items, using biomass! 

With that we can slowly step by step follow our goal of the reduction of plastic around the world!  With the Hare hare Tumbler being made from that kind to the environment material, a transparency higher than that of some glass, being unbreakable when dropped, heat-resistant, and heat retentive, we think we have made a product that can help us towards this goal!


●When cleaning, please use a soft sponge to clean. 

●The Hare hare Tumbler is not suitable for microwaves, ovens, or dishwashers. If used in these machines, the tumbler may become misshapen or  damaged.

●Please don’t use it on open fires or high heats. 

●Please don’t use with the following liquids:

Bleach・ Alcohol based cleaners・ Thinner・ Gasoline ・ Alkaline Detergent・ Other liquids that you may think may have a bad impact on the tumbler

●If the tumbler becomes damaged in any way, please refrain from using it.

●When using the tumbler with hot liquids, please be careful as the tumbler won't get hot and the drink or hot liquid may burn your mouth. 

●If very strong coffee is left in the cup for too long, there may be some discolouring, so please be careful.



Risks and challenges

・We unfortunately can't offer refunds after the end of the project. We ask for your understanding in this circumstance. ・During the crowdfunding campaign as well as the production period, the design or materials used may change. ・There may be slight differences in the above images compared to the tumbler you receive. We ask for your understanding in this matter. ・The shipping of the Hare hare Tumbler may be delayed due to several factors. This may be due to the coronavirus affecting the production of the materials as well as how many items need to be produced. If there is any change in the project, we will let everyone know via the updates section. ・In regards to import fees, these are handled on the side of the backer. Please be aware of this before backing.

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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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Warmth Co.

At Warmth Co. Ltd, our main business is the wholesale of spectacles at retail stores. However our aim is to help reduce the plastic waste found all over the world. We are looking at the creation of lenses and frames, as well as other items, using biomass!

Select a return to support!

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

Pledge ¥5,890 or more Early Bird Coloured Hare hare Tumbler

Get 10% Off of the JKF Special Price with this Early Bird Return! Get your hands on this specially made biodegradable Hare hare Tumbler, which is exclusive due to its special colouring! The Hare hare Tumbler makes other glasses look plain in comparison! Choose from one colour at the end of the project! Purple/Green/Red/Blue INCLUDES: Coloured Hare hare Tumbler (Purple/Green/Red/Blue)

Pledge ¥5,995 or more JKF Special Clear Hare hare Tumbler

Get you hands on this specially made biodegradable Hare hare Tumbler that makes other glasses plain in comparison! INCLUDES: Clear Hare hare Tumbler

Pledge ¥6,545 or more JKF Special Coloured Hare hare Tumbler

Get you hands on this specially made biodegradable Hare hare Tumbler which has also been specially coloured that makes other glasses plain in comparison! Choose from one colour at the end of the project! Purple/Green/Red/Blue INCLUDES: Coloured Hare hare Tumbler (Purple/Green/Red/Blue)

Pledge ¥11,390 or more JKF Special Clear Hare hare Tumbler x2

Get 5% off of the JKF Special Price with this Early Bird Return! Get your hands on these specially made biodegradable Hare hare Tumblers! The Hare hare Tumbler makes other glasses look plain in comparison! INCLUDES: 2× Clear Hare hare Tumbler

Pledge ¥11,660 or more Mixed Double Pack Hare hare Tumbler

Get 7% off of the JKF Special Price with this Early Bird Return! Get your hands on these specially made biodegradable Hare hare Tumblers, one of which are exclusive due to their special colouring! The Hare hare Tumbler makes other glasses look plain in comparison! Choose from one colour at the end of the project! Purple/Green/Red/Blue INCLUDES: Clear Hare hare Tumbler Coloured Hare hare Tumbler (Purple/Green/Red/Blue)

Pledge ¥12,435 or more JKF Special Coloured Hare hare Tumbler x2

Get 5% Off of the RRP with this JKF Special Price! Get your hands on these specially made biodegradable Hare hare Tumblers, which are exclusive due to their special colouring! The Hare hare Tumbler makes other glasses look plain in comparison! Choose from two colours at the end of the project! Purple/Green/Red/Blue INCLUDES: 2× Coloured Hare hare Tumbler (Purple/Green/Red/Blue)

Pledge ¥21,820 or more Mixed Double Pack Hare hare Tumbler x2

Get 13% off of the RRP with this JKF Special Price! Get your hands on these specially made biodegradable Hare hare Tumblers, two of which are exclusive due to their special colouring! The Hare hare Tumbler makes other glasses look plain in comparison! Choose from two colours at the end of the project! Purple/Green/Red/Blue INCLUDES: 2× Clear Hare hare Tumbler 2× Coloured Hare hare Tumbler (Purple/Green/Red/Blue)

Pledge ¥23,975 or more JKF Special Hare hare Tumbler x5

Get 20% Off of the RRP with this JKF Special Price! Get your hands on five specially made biodegradable Hare hare Tumblers that makes other glasses plain in comparison! INCLUDES: 5× Clear Hare hare Tumbler

Pledge ¥25,740 or more JKF Special Full Set Hare hare Tumbler

Get 20% Off of the RRP with this JKF Special! Get your hands on these specially made biodegradable Hare hare Tumblers, four of which are exclusive due to their special colouring! The Hare hare Tumbler makes other glasses look plain in comparison! You will receive one of each colour plus a clear version! INCLUDES: Clear Hare hare Tumbler Red Coloured Hare hare Tumbler Blue Coloured Hare hare Tumbler Purple Coloured Hare hare Tumbler Green Coloured Hare hare Tumbler

Pledge ¥5,395 or more Early Bird Clear Hare hare Tumbler

Get 10% Off of the JKF Special Price with this Early Bird Return! Get your hands on this specially made biodegradable Hare hare Tumbler! The Hare hare Tumbler makes other glasses look plain in comparison! INCLUDES: Clear Hare hare Tumbler

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