Regular-fit tracksuit bottoms by BOSS Menswear, crafted in active-stretch jersey with signature-stripe tape and contrast branding. Part of the dynamic BOSS x Matteo Berrettini capsule collection, co-created by the Italian professional tennis player. For our RESPONSIBLE products, we always use at least 60% more sustainable raw materials. This garment is made partly with certified recycled polyester. Recycled polyester is an artificial fiber made from oil-based waste such as old PET bottles. It is a more sustainable option compared to conventional polyester, as we can reuse a material that has already been produced. Using recycled polyester also reduces plastic waste and stops it from ending up in landfills. We only use raw materials with a verified chain of custody to ensure the use of certified recycled polyester.