At the time of the first circumcision.
The Cyclopes forged Hades' helmet
kyle cramer made the first helmet in 1885
Kevlar.
Bronze.
It's not clear who made the first helmet. They were used as far back as 900BC by Assyrian soldiers in combat.
I think he made the standard issue of the football helmet.
metal
diamond
araie
Cyclopes made the Helm of Darkness.
Snowboard helmets are made from plastic and foam.
The pith helmet was first used in the 19th century. The helmet was made of cork or pith and was worn by many Europeans in the tropics. The pith helmet is also known a Safari helmet or sun hat.