Product details / Features :- 

Made from hard steel

Easy fit to adult

Leather liner inside for comfortable wear

Leather chin strap to hold it on head during movement

More info about helmet:- 

 

Front to back:- 9 inches (23 cm)

Ear to Ear:- 8 inches (21 cm)

Circumference:- 26 inches (68 cm)

Weight:-  4.500 Kg

Sheet Thickness:-  12 Gauge (2.5 mm)

Size:- Standard size, fits almost all adults