Recycling essentially describes the process of returning waste from production or use to a cycle and reusing it. The original product is modified and used in a new context. Such strategies are relevant for ecological, social, and economic sustainability because they conserve resources and can reduce waste.

However, recycling can be further differentiated in terms of quality. In downcycling, a material loses quality during the recycling process. This process can be repeated several times as long as the material is still usable, but leads to a devaluation in the long run. Despite this limitation, downcycling is often more sensible than using entirely new raw materials.

Upcycling takes a different approach. It involves upgrading existing materials without adding new resources. Particularly in the fashion industry, numerous labels have specialized in this approach, creatively reinterpreting existing textiles or production remnants. Upcycling represents creative freedom, but usually requires individual solutions and is difficult to scale.

Closely related to this is the principle of circularity, often discussed under the term Cradle-to-Cradle. The goal is to design products from the outset so that they can be completely returned to biological or technical cycles after their use. Design, material selection, use, and take-back are considered as an interconnected system. In fashion, this means, among other things, considering future recyclability right from the cut and fiber composition stage.

However, the textile sector in particular demonstrates how complex these approaches are. While blended fabrics made from biological and synthetic fibers are often considered "recycled," in practice they are difficult to reintegrate into clean cycles. When materials from different cycles are combined, a hybrid is created whose reuse is usually only possible through downcycling – a process that requires significant energy and results in a loss of quality.

For this reason, the question of which forms of recycling are sustainable in the long term is increasingly coming into focus. One approach is to reuse textile waste within the production process itself. For example, fiber remnants from spinning mills are reused and combined with fresh natural fibers to create stable yarns. Such pre-consumer recycling processes prevent waste without fundamentally hindering the circular economy.