Liner M-31 size 64/57 (reproduction). Also suitable for M-35, M-40, M-42 helmet.
Insert size 64. For head circumference 56-57cm. liner: external and internal steel hoops. Leather 0.9-1.2 mm lined with natural felt. Strap: vegetable tanned leather 2.5-2.7 mm thick. steel buckle, steel coils.
Premium vegetable tanned leather (not dyed). Only the best materials were used in production. You will receive exactly what you see in the photo.
The package includes:

1. Liner 64/57.

2. Chin strap.

3. Hairpin for fixing parts of the helmet. 3 pieces