A helmet is hard head gear. 
A combat helmet is hard gear. 

A combat helmet is a type of armor. 
Helmets come in many shapes. An enclosed helmet covers the whole head. This can include the neck. A bowl helmet only covers the top of the head. Some helmets are low-cut. These cover the ears and the sides of the head. 
Modern helmets use new materials. They use things like Kevlar to stay light. This helps protect against shock waves. They also have rails. These rails let people attach tools. You can mount cameras or night-vision goggles. 
A combat helmet is a special kind of body armor. 
Helmets work by acting as a hard shield for the skull. Early versions were made from leather or brass. Later, people used bronze and iron to make them stronger. By the year 950, many societies made helmets from forged steel. Modern helmets use special materials like Kevlar or Twaron. These materials are very strong but also quite light. Inside the helmet, soft padding is used to soak up energy. A 2011 study found that padding can decrease impact force by 24 percent.
Humans have been making helmets since ancient times. The Akkadians and Sumerians wore them in the 23rd century BCE. Mycenaean Greeks used them starting in the 17th century BCE. During the Middle Ages, knights often wore enclosed helmets. These covered the whole head and sometimes the neck. These helmets were often used by high-ranking military leaders. Later, the development of new guns changed how helmets were made. 
Many famous helmets have been used in big wars. During World War I, the French used the Adrian helmet. The British used the Brodie helmet, and Germans used the Stahlhelm. In World War II, the American M1 helmet became very common. 
There are many different shapes of helmets today. An enclosed helmet covers everything, including the face. A bowl helmet only covers the top of the head. Low-cut helmets cover the ears and the sides. High-cut helmets are lighter and leave more room for headsets. Some people even use bump helmets for sports like skateboarding. Modern helmets often have rails on the sides. These rails act like a platform to hold cameras or night-vision goggles. This makes the helmet a tool for more than just protection.
A combat helmet is a specialized piece of body armor.
The mechanism of protection has changed as weapons have advanced. Early helmets protected against close-range strikes and thrown objects. They were often made of leather or brass. During the Bronze and Iron Ages, soldiers used bronze and iron. By approximately 950, many societies transitioned to forged steel. This material provided better defense against swords, arrows, and low-velocity musketry. In the late 20th century, materials like Kevlar and Twaron replaced steel. These synthetic materials are lighter and offer superior ballistic protection. Internal padding also plays a critical role in safety. A 2011 study by Lawrence Livermore National Laboratory showed that padding can decrease impact force to the skull by 24%.
Helmets are categorized by how much of the head they cover. Enclosed helmets protect the entire head and sometimes the neck. 

The history of combat helmets spans thousands of years. The Akkadians and Sumerians wore them in the 23rd century BCE. Mycenaean Greeks utilized them starting in the 17th century BCE. Assyrians used them around 900 BCE. As firearms and cannons developed, traditional armor became largely obsolete. However, lightweight helmets remained useful for identification and basic protection. During the Napoleonic era, some armies reintroduced ornate cavalry helmets. The massive increase in artillery during World War I renewed the need for steel. 
Significant developments occurred during the World War II era. The American M1 helmet and the Soviet SSh-39 were widely used. Soldiers began using helmet covers for better camouflage. These covers were either mesh nets for foliage or cloth patterns. During the Cold War, older steel helmets became inadequate against new weaponry. This led to the redesign of helmets in the 1970s and 1980s. The American PASGT was a major improvement in this period. These changes focused on reducing weight and preventing traumatic brain injuries. 
Modern helmet design focuses on integration and modularity. Many 21st-century helmets feature STANAG rails on the sides. 
Combat helmets connect to the broader study of materials science and human safety. The shift from iron to Kevlar shows how chemistry changes warfare. The study of impact force shows how physics protects the human body. Even sports equipment, like the Pro-Tec skateboarding helmet, shares design roots with military gear. 
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