Attention! Dark brown felt! Not the same as in the picture.
Wool for helmet liners. Tight but soft wool, 1,5 mm (1/17 inch). Stripes are 4 cm (1⅔ in.) wide and 62 cm (24½ in.) long. It's to be sewn to leather and then fastened to an M31 liner and it's modifications by metal clips (tabs).