At A Glance. Materials: 76% bamboo, 17% recycled cotton, 4% spandex and 3% polyester.. Colours: Black, White. Sizes: 35-38 / Small, 39-42 / Medium, 43-46 / Large. Certifications: WRAP, SEDEX, GSS, and BSCI certification. Designed in Sweden. Manufactured in China. Swap your underwear and get a new one any time with A Good Loop. Detailed Information. What materials are used: 76% bamboo, 17% recycled cotton, 4% spandex and 3% polyester.. Packaging: A red Stone Paper box. How we bring it to our warehouse: We ship in bulk without any plastics. Transport method to warehouse: Train / Sea. Factory: The Socks Factory. Climate issue addressed: Water waste; chemical use. Time to market: 12 months. Weight: 0.38 kg. How to recycle: Clothes recycling but we ask you to use A Good Loop