This item is made of 100% recycled materials (70% cotton, 24% polyethylene, 1% polyacrylic and 4% other fibers). Recycled materials are sorted, graded and repurposed to create new fabrics and preserve natural resources. The lining is made of 56% recycled polyester and 44% viscose, which ensures the breathability of the fabric. The buttons are of recycled metal and are nickel free. All components of the garment are oekoetex-100 certified, which indicates that the garment is harmless to people and nature.