German Paratroop type helmet liner is solidly constructed with metal circumference band, supple leather interior cover and foam spacer cushions. Can be used to reline German Paratroop helmets of WW2, French M51 helmets and many, many, other types as long as the ‘helmet shell’ accepts the circumference of this liner. Circumference of the Outer band is @71 centimeters or 28 inches. Inner circumference of liner is @62 cm or 24.5” . Comfortably handles U.S. head size 7-1/2” to 7-5/8”. (Large)