Borrenberghs works mainly with deadstock materials that compose 60% of the garment collection with polyester and jersey fabric deadstock. However, the brand is shifting to 100% natural, chemical-free fabrics. While deadstock materials are more sustainable in keeping them out of landfills or preventing environmentally harmful disposal methods, Borrenberghs aims to one day have a fully organic supply chain to achieve a fully transparent production process. While the brand has some way to go to reach this goal, they are actively working towards it.
Other than deadstock, the brand is currently working with other materials such as sustainable GOTS-certified organic cotton and other less sustainable Oeko-Tex-certified synthetic materials such as viscose, bamboo jersey, and Punta di Roma fabric, which conventionally consists of polyester, viscose, and lycra blends. These certifications ensure the sustainability of the production process of these fabrics, yet the details of these certifications are not specified and hence cannot be verified.
They also claim to use other materials such as silk certified by Seri.co, which guarantees the health of workers and environment in line with requirements from ISO 9001 (quality system management), ISO 14001 (environment management), ISO 45001 (safety management) and SA 8000 (social responsibility). They also state the use of GOTS-certified mulesing-free wool, Cupro, a type of regenerated cellulose made from cotton waste, and Tencel, which is a more sustainable synthetic fibre. However, these products are nowhere to be found in any product descriptions of the garments.
Borrenberghs works with a made-to-order system to avoid overproduction. However, they will soon change to working with upfront stock in the next collections. The garments will continue to be produced in small quantities and stay exclusive and unique so that each piece is cherished. Any leftover fabrics are used to make limited edition pieces so that no fabric is wasted.
This brand works with fully sustainable e‑commerce packaging with the company Rajapack. Their boxes are made of recycled products and are FSC-certified. The shipping label is also made from FSC-certified silicon paper, printed by a sustainable printing company. Forest Stewardship Certification (FSC) guarantees that the materials are sourced from sustainably managed forests and local communities.
This brand also contributes 1% of its annual sales to non-profit organisations dedicated to protecting the planet, its ecosystems and wildlife. They have also made a partnership with Bollebos VZW to plant a mix of native trees in Belgium, which strengthens and rejuvenates local forests to increase carbon capture.