Pure Materials

At Kuyichi we take great care in the design of our pure goods focusing on the development of timeless products that can become your favourite. Not only do they have to stand the continuous change of trends, but they should also be worn until they tear. We choose high-quality materials and work on the longevity of our jeans constantly to achieve this. We love to give you some more info on the different materials and processes that we use.

If you want to dive deeper into the whole process of our products, from the design to the final finish, you can check our sustainability report for some in-depth information on our supply chain and practices.


our materials

Organic cotton

All the cotton we use is 100% organic cotton. Organic crops are grown without the use of chemical fertilisers, pesticides and insecticides. Organic cotton is 100% pesticide free. Pesticides pollute soil and water, killing wildlife and harming communities. Creating organic cotton yarn reduces CO2 emissions by 60% compared to conventional cotton.

Recycled cotton

Since 2012 we have been using recycled cotton in our denim fabrics. Cotton waste is captured or collected, shredded and re-spun into a new one-of-a-kind yarn. Recycling greatly reduces the water, energy and chemicals needed to produce virgin fibres. All products stating recycled cotton use cotton fabric and fibres that are wasted in the production chain. From fibres captured during the spinning, dyeing and weaving processes, to fabric scraps in the cutting stage. This way we cut down and utilise waste streams in our facilities.

Recycled Polyester

To make recycled polyester, plastic bottles are collected, shredded and re-spun. This saves over 75% of the greenhouse gas emissions and more than 90% of the chemicals needed to produce virgin polyester. Furthermore, recycling PET stops plastic from polluting the land and oceans. We use the GRS (Global Recycling Standard) certificate on fabrics that contain recycled polyester. This guaranteed that only post-consumer PET bottles are used for our recycled polyester yarns.

Post-Consumer recycled cotton

PCRC stands for Post-Consumer Recycled Cotton, which means that the fibre used for new denim, has already had a full life. It has been produced, worn, and discarded. After cutting off the top of the jeans, the remains are shredded and then blended into new yarns. The top with the waistband is cut off as it contains a lot of metal parts, that can disrupt the shredder. Using the post-consumer clothing waste stream has several benefits. Fewer clothes will end up in landfill and fewer chemicals and water are needed for cotton production and fabric dyeing. Increasing the use of PCRC is part of the Denim Deal we signed.


TENCEL™ Lyocell is the sustainable sister of viscose, made by Lenzing. Tencel is made from controlled and certified wood sources. It uses a closed-loop production process, which transforms wood pulp into cellulosic fibres with a low environmental impact. The process recycles water and reuses solvents for over 99%. TENCEL™ Lyocell feels soft on the skin, doesn’t crease, and is durable and compostable. We only use Lenzing TENCEL™ Lyocell. We see them as the leader in the development of sustainable man-made fibres, with high environmental and social standards.


Another product by the hands of Lenzing. TENCEL™ Modal is a super soft fabric that uses finer fibres compared to normal modal. It is made from mainly beech wood, sourced from sustainably managed forests in Austria and other European countries, and harvested from certified and controlled forests. TENCEL™ Modal is produced in an eco-responsible way at the Lenzing sites in Austria. These fibres have a low environmental footprint and are both biodegradable and compostable. This means that they can fully revert back to nature.


REFIBRA™ technology is the first step for Lenzing towards a circular textile industry. These cellulosic fibres are made with the same award-winning closed-loop process as TENCEL Lyocell™ fibre. The REFIBRA™ technology upcycles cotton scraps from garment production and post-consumer cotton textiles into renewed fibres. The recycled cotton pulp - up to one-third - is added to certified wood pulp and used to produce new TENCEL™ Lyocell fibres. Lenzing pushes to increase the amount of recycled cotton for the TENCEL™ x REFIBRA™ fibres to at least 50% in 2024.


Linen is made from the strong fibres in the stems of the flax plant. Flax is a low demanding plant, growing well in more mediate climates. The flax plant needs few to none pesticides. It’s one of the strongest - and oldest - fibres out there with a high durability. Linen gives your clothing a nice fresh, crisp and richly-textured feeling. All our linen is farmed in Europe, in France and Belgium to be exact.

T400 Ecomade

T400 ecomade is an innovation fibre from Lycra. It’s composed of one part recycled PET polyester, one part plant-based polymers, and one part virgin polyester. The different components react differently to your body's warmth, creating the stretch while keeping the shape of the fibre. This means your denim literally needs to warm up to you to give a comfortable stretch to your body. The biggest benefit of the T400 ecomade is the recovery, it turns back to its original shape after cooling down, creating a lasting fit for your denim.


Hemp is a fast-growing plant made from stem fibers of the cannabis sativa plant. This plant captures carbon from the air faster than trees and most other plants. Which means, using more hemp for clothing could help lower our carbon emissions! Hemp is perfect for crop rotation as it enriches the soil but it can also be grown season after season as it enriches the soil. Because hemp grows so fast, it uses less land and water compared to other crops like cotton or trees, creating less environmental impact. We love hemp because it makes our pure goods stronger, more absorbent and more durable!

vegetable-tanned leather

We strictly only use vegetable-tanned leather. Using vegetable tanning reduces chemical risks like heavy metals and other harmful substances used in the production of leather, protecting both the environment and the workers. Vegetable tanning is an old craftmanship that keeps nature in mind. Combine this with new environmental practices and you’ve got yourself a clean process. All leather we use comes from European cows that are primarily farmed for their meat and is therefore a by-product of this industry. More about our leather suppliers here.


Pure process


There are a lot of different ways to create a more sustainable wash on your denim. Every style has its unique wash recipe to get to the ideal ‘worn-in’ look. You can use different technologies like laser, ozone and e-flow machines or substitute harmful chemicals for better low-impact ones. We constantly work on improving our washes by incorporating these options in our wash recipes. Read more about low-impact wash techniques here. Water-saving techniques are not only used during washing, also in our dyeing processes our suppliers limit the consumption of water. Besides they take care that the wastewater that comes out of the processes is cleaned and filtered and recycled as much as possible. The best options are our undyed denim items.


EIM stands for Environmental Impact Measuring. This tool is developed by Jeanologia, a company which develops machines and sustainable technologies for the fabric and garment finishing industry. EIM makes it possible to calculate the exact water, energy, chemicals and worker impact of our pure goods! In our sustainability report, we dive deeper into the numbers behind our denim washes and the results that we have booked this far. You can find the report at the top of this page.


In our dyeing and washing processes, we focus on using new techniques and better chemicals with a lower environmental impact. These chemicals comply with ór the certification the product or fabric has or our (M)RSL. Part of this document is the Zero Discharge of Hazardous Chemicals MRSL, which restricts hazardous inputs throughout the chain. Certifications with chemical restrictions we often used on our products or fabrics are GOTS, GRS and OEKO-TEX 100.


Since 2016 we’ve replaced the leather patches with jacron patches on the back of our jeans. Jacron is a washable and resistant material made from - in our case recycled - paper and glue. By using jacron patches, our jeans became vegan-proof. From 2020 we’ll gradually change to the Viridis patch from Panama trimmings. These green PU patches are made from 48% corn polyols, 26% cotton and 26% normal PU. Not only are our patches a vegan substitute for leather ones on denim, it also has a lower environmental and worker impact.


We were the first denim brand using Ecoverde recycled polyester sewing threads by Coats. These recycled threads have exactly the same performance and durability as the non-recycled threads that are conventionally used but bring the benefit that no new resources are needed to produce the yarn. Coats, as a global leader in sewing threads, is working on improving their own sustainability and the ecoverde thread is one of the outcomes of this process.
Certificates & Initiatives
Certificates & Initiatives

Certificates & initiatives

global organic textile standard

GOTS stands for the Global Organic Textile Standard. This is a global textile standard for organic fibres, which also includes ecological and social criteria. The aim of the standard is to ensure organic standards – from farming through the manufacturing process to the labelling – proven by a chain of custody. GOTS offers a credible global certificate to the consumer, from materials to the end product. GOTS has different certification levels; raw materials, yarns, fabrics and products can be GOTS certified. All the organic cotton we use, some of our fabrics (even our pocket lining!) and some full products are GOTS-certified.

Global Recycling Standard

The Global Recycling Standard is the twin sister of GOTS brought to life by Textile Exchange. GRS proves verified recycled content and also includes social and environmental criteria and chemical restrictions in processing. With GRS the origin of recycled material is also confirmed as pre- or post-consumer of all kinds of fibres, from natural to synthetic. At least 20% of the fibres in a product need to be of recycled origin to apply for a GRS certificate. We often use GRS for fabrics and products with recycled content.

Organic Content Standard

In our fabrics with recycled fibres we do of course also use organic fibres. OCS certification is a standard to claim this organic content. They do not have extra criteria when it comes to environmental, chemical or social standards. Instead, they fully focus on the credibility of organic content. If a product consists of 5% to 95% you can apply for OCS blended certification or if more than 95% of the fibres are organic, OCS 100 can be applied for. For our recycled fabrics, we often use OCS blended certification as proof of the organic content.


OEKO-TEX 100 is a certification standard that focuses on quality and chemical safety of textile products and accessories. The standard works with a criteria catalogue to which all different components of a product need to comply. Independent parties perform tests to check on, for instance, substances that are harmful to our health. In practice this means that all of our zippers, buttons and sewing threads are tested and clear of harmful substances. Also some of our fabrics are OEKO-TEX 100 certified, which means that the dyeing process is within the chemical limitations of the standard.


We’re very proud that almost all of our Pure Goods are fully vegan! Almost all our products are fully free of any animal contents, if not we mention this in the info of a product. All vegan products are easily recognisable by reading the 'Certifications & Sustainability' info on the product page.

From the beginning, Kuyichi has been opposed to using fur, which is why we're both on the Fur free retailer list and Bontvrijlijst.


Since the beginning of 2020, we're a member of the Fair Wear Foundation. Fair Wear is an international independent organisation that fights for better labour conditions in the fashion industry. Since the beginning of 2020, we are a proud Fair Wear member. Fair Wear works on the principles of their ‘Code of Labour Practice’ (their own code of conduct), based on 8 internationally agreed labour standards, such as no child labour and reasonable working hours. Fair wear has a lot of tools and (local) in-depth knowledge to help us do better. With their support, we will work relentlessly on improving working conditions.


With signing the Transparency Pledge last November we pledged to at least bi-annually publish on our site an updated supplier list, stating full name, address, parent company, type of products, and worker numbers. We’ve also uploaded this list to the Open Apparel Registry, an online database with all publicly available supply chain data. This database uses publicly available supplier lists or brands can upload their own. The goal is that the database sparks collaboration between brands and NGOs and between brands that share the same facility to improve the working conditions in these facilities.

Ethically made to last since 2001