Repro M1915 French helmet liner

This is the top repro of French WWI M1915 Adrian helmet liner. The liner is made from dark brown leather and blue felt. The Adrian helmet has 3 basic sizes A, B a C. Than every letter has 3 different head sizes. It's easy to find out which size you have. You must measure around the outside of the shell just above the brims. A = 61cm, B = 64cm, C = 67cm. Than just choose head size.