This copy of a Viking-Norman helmet is handmade of steel, based on an original of around 900 AD.
It fits every head up to a size of 63 cm / 24.8" (helmet inner liner size).
Width: 19 cm / 7.5" (ear to ear)
Inner length: 22.5 cm / 8.8"
Weight: 1.1 kg / 2.4 lbs
Material-thickness: 1,5 mm = 17 gauge