The helmet (the 15th century loan from either Middle French, a diminutive of Frankish helm, from Proto-Germanic *khelmaz, PIE *kelmo- "a cover") occurs as form of protective clothing worn on the head and usually manufactured of metal or even some other stiff substance, occasionally for protection of the head from either falling objects or high-high-velocity collisions.

Helmets come green in the military, construction, mining and some sports, including American football, baseball, hockey and rock climbing. Motorcycle helmets and bicycle helmets are mandatory headgear within a bit of jurisdictions; in the United Kingdom only Sikhs are allowed to ride motorcycles without wearing bike helmets.

Helmets come among a virtually all ancient forms of protection, & come known to stand been worn by ancient Greeks and throughout the Middle Ages; at this time it were primarily military devices, protecting a head from either cutting blows sustaining swords and flying arrows. It were ab initio constructed from either leather, but yet come to exist as processed totally from either iron, with the kind of functional sweetening. Military utilize of helmets declined when firearms became widespread, in which traditional helmets offered little protection. But, sustaining a increasing apply of heavily artillery, the steel helmet manufactured the comeback in the 20th Century as protection for the head from shrapnel.

Helmets utilized for different purposes differ greatly in their project. E.g., the bicycling helmet would in the main exist as called upon to protect against blunt impact forces, virtually all unremarkably to the temple & sides of the head. The helmet designed for rock climbing, but, would want to protect against objects (e.g., little rocks & climbing equipment) falling from above, however would have a decreased require for protecting against impacts to the side of the head. Consequently, bicycling & rock climbing helmets develop little resemblance to both more. Practical concerns as well dictate helmet project. The bicycling helmet would sooner exist as streamlined within shape & probably swell ventilated, when the rock climbing helmet would become lightweight & by having the minimum of bulk to reduce any prejudicious outcome on the climber's system.

Goggles and face guards are more forms of protective headgear. Which are actually non usually required when wearing a helmet that protects the eyes or even face too. Hard hats are usually favorite within modern days for hard hat.