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.

Cotton in conversion

Cotton in conversion is the fibre produced during the transitional period from a conventional cotton farm to organic cotton production. This process takes up to three years, in which farmers follow organic farming practices and focus on soil health. However, the cotton fibre is not yet certified as organic. By supporting farmers in converting to organic cotton, we rebuild the relationships in our supply chain and can directly contribute to positive change in the field. We started our first cotton in conversion project with our Turkish denim mill Bossa in 2022.

Read more about cotton in conversion


TENCEL™ Lyocell is made by Lenzing and sourced from controlled and certified wood. It uses a unique closed-loop production process, which transforms wood pulp into cellulosic fibres with a low environmental impact. The process recovers and reuses the water and the solvent for over 99%. TENCEL™ Lyocell feels soft on the skin, it is durable and biodegradable. TENCEL™ is a trademark of Lenzing AG. Read more about TENCEL Lyocell.


TENCEL™ Modal fibres are well known for their softness. They are made from mainly beech wood, sourced from certified and controlled forests in Austria and other European countries. TENCEL™ Modal are produced in an eco-responsible way. These fibres have a low environmental footprint and are both biodegradable and compostable. This means that they can fully revert back to nature. TENCEL™ is a trademark of Lenzing AG.

Read more about TENCEL Modal.


TENCEL™ Lyocell x REFIBRA™ technology are 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™ fibres. 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. TENCEL™ and REFIBRA™ are trademarks of Lenzing AG. Read more about TENCEL™ x REFIBRA™.

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.


In our dyeing and washing processes, we focus on using new techniques and better chemicals with a lower environmental impact. These chemicals comply with the KUYICHI RSL and MRSL. The RSL are chemical limits for the final garment that are based on the OEKO-TEX 100 standard. The MRSL adopts the Zero Discharge of Hazardous Chemicals (ZDHC) MRSL and lists chemical substances that are banned from intentional use for production processes in our garments. We also have an offer of certified garments that comply with the chemical standard of ‘Global Organic Textile Standard’ (GOTS) or ‘Global Recycle Standard’ (GRS). For more information check our sustainability report at the top of this page.