Solar Helmet made of palm leaves

A hard hat is a type of helmet used to protect the head from injury due to falling objects. Suspension bands inside the helmet spread the helmet's weight and the force of any impact over the top of the head.
In the early years of the shipbuilding industry, the was constant danger of dock workers being hit on the head by objects dropped from ship decks, workers covered their canvas hats with pitch (tar) and set them in the sun to cure. In the United States, early miners hats made of leather. World War I protective gear inspired the birth of the metal hardhat, with an internal suspension to provide a more protective headgear. Aluminium, fibreglass, thermoplastics are the many materials developed over the years.
This hard hat made of bamboo, with the stake and strand technique has the advantage of being lightweight and cool.