Closed draws heavily on its own European heritage and works ambitiously on becoming sustainable while upholding high-quality standards. Their goal is to produce collections with less of an environmental impact, such as introducing their eco-friendly denim line A BETTER BLUE, which is 100% produced in Italy using sustainable materials, gentle dyeing methods, and low-impact washing methods, as well as producing over 80% of the products locally in Europe. All of these practices save water, energy, and chemicals. Some of the materials used are Thermore® Ecodown® filling, made of 100 percent recycled PET bottles, recycled polyester, recycled nylon, and recycled cashmere. Offsetting carbon emissions is another important part of this brand's sustainable efforts. Their Hamburg headquarters and warehouse have been carbon neutral since 2018.