Borrowing from utility, this modern cap is made from recycled nylon with breathable mesh panels at either side. It's designed with a drawstring toggle for a personalised fit. Toggle closure. Recycled polyamide is polyamide made from textile waste in production Shell: 100% Recycled polyamide (Recycled nylon). Details and lining: 100% Recycled polyester. Excluding trims Inner circumference of size XS/S is 57cm, M/L is 59cm COS Mesh-Panelled Nylon Cap in Black - Men