In many films, shows, and games, leather armor is often portrayed as low-tier protection—easily cut through, offering little defense, and only valued for its light weight and flexibility. These impressions mostly come from soft leather clothing or cosplay armor that look like real gear but offer no real protection. However, in history, leather armor used in actual battles had much better defense than most people imagine. Today, let’s take a closer look at the true strength of leather armor.
Most people only come into contact with tanned leather, which is soft and flexible. Even heavy-duty leather boots may seem tough, but they offer very little defense. When facing a sharp weapon, tanned leather usually cannot stop a blade at all.
There was once an accident during a cutting competition where a sword rebounded off a bamboo target, bounced on the ground, and then flipped up and hit the contestant’s foot. Even though the blade had lost much of its power after bouncing twice, it still easily cut through his hard leather boot and left a deep wound. This kind of leather, used in daily life, doesn’t represent the kind of leather used in real armor, so it’s no surprise that people often underestimate leather armor’s strength.
Real leather armor, especially made from rawhide (untanned leather), is a completely different material. Once dried, rawhide becomes extremely hard. In personal tests with machetes, one-handed axes, single- and two-handed swords and axes, almost no weapon other than a heavy two-handed axe could break through properly treated rawhide. However, this kind of stiff leather is so hard that it’s unsuitable for making shoes or clothing—it’s too uncomfortable. That’s why most people never come across this type of leather in everyday life.
Although rawhide becomes very tough when air-dried, it’s easy to work with. Soaking it in salt water overnight softens it again for cutting and shaping. Salt water also prevents the leather from rotting. In ancient times, when salt was rare, people used other strange solutions or even boiled the leather to soften it and then molded it. This made leather armor relatively easy to make—even for prehistoric humans using stone tools. That’s why it’s very possible that leather armor existed long before written history began.
However, leather decomposes easily, so very few leather armors have survived. The earliest known remnants of leather armor come from over 3,000 years ago, found in China’s Yin ruins. But humans have used animal hides for tens of thousands of years, and air-dried animal skin becomes very tough. While tanning leather to make it soft requires skill, simply drying a hide and shaping it is easy—early humans may have done this to protect themselves in combat or while hunting.
Ordinary cowhide, while tough, is still quite thin. It doesn’t hold up well under stabbing attacks, even though it can handle slashes better. To solve this, ancient Chinese craftsmen used rhino hide, which is far thicker and harder than cowhide. Historical records mention the use of rhino skin in armor making. Having handled some preserved rhino hide personally, I can say it’s incredibly dense. Without much processing, dried rhino hide could provide defense on par with metal armor but at only half the weight or less. Unfortunately, this demand led to the overhunting and extinction of rhinos in ancient China.
Though cowhide and rhino hide sound similar, they are very different. Cowhide is much thinner and needs to be reinforced. To make cowhide strong enough, ancient armor makers glued multiple layers together. While reaching the thickness of rhino hide would take four to five layers of cowhide, a standard leather armor typically used about three layers to provide sufficient protection.
Before layering, the cowhide had to be processed. Fresh hides are often shipped just air-dried, so the first step is removing the hair. This isn’t done by burning like with pork skin. Instead, craftsmen soaked hides in limewater made with quicklime. The lime breaks down the proteins in the hair and also helps clean off leftover fat and tissue from the skin.
This process, called “liming,” takes time and care. The hides must be stirred three times a day in the limewater. Soaking time depends on temperature—usually about a week in summer and two in winter. Once the hair starts to come off, the hides must be removed quickly to avoid weakening from over-soaking. Then, the hides are rinsed thoroughly. Leftover hairs must be scraped off by hand with dull blades, and both sides of the leather must be cleaned of any fat or meat. Only after this is the leather ready for armor-making.
Next, the leather needs to be hardened before gluing layers together. Different regions used different methods. One popular technique involved boiling the leather in beeswax, which seeps into the fibers, making the leather waterproof and much harder. The result feels like tough plastic and resists stabbing well. In China, craftsmen often soaked leather in tung oil instead, which also adds hardness and protects against water and insects.
As early as the Spring and Autumn period, the ancient Chinese book Kao Gong Ji (The Artificers’ Record) mentions that “armor must first be shaped using a mold.” This means that armor wasn’t just dried leather—it was pressed into molds and glued together into curved shapes, which are stronger than flat pieces.
But it didn’t stop there. According to the Wubei Yaolue (Essential Military Techniques), after coating the hardened leather in oil, craftsmen would sprinkle iron filings on top and hammer them into the leather, then repeat the process. This created armor that was nearly as strong as metal but much lighter. In other cases, leather was coated in multiple layers of lacquer to increase hardness even more.
Lacquer is a natural product from East Asia, also called “urushi.” Once dried, it forms an extremely hard shell—stronger than modern synthetic paints. To fully coat leather armor, at least four layers of lacquer were used. The result was armor that made a metallic sound when struck and could survive for millennia. In fact, lacquered leather armor from the tomb of Marquis Yi of Zeng, over 2,000 years old, was still well-preserved when discovered.
Outside of China, people used other hardening methods. For example, Egyptian leather scale armor was coated with shellac (a resin made from insect secretions) for protection and stiffness. And in China, some leather armor was reinforced even further by mixing powdered porcelain into the lacquer. According to the Wubei Zhi (Military Records), porcelain bowls were crushed and sifted, then mixed with lacquer and brushed onto the armor before being oiled. Since porcelain is harder than most steel, this would dramatically boost the leather’s surface hardness. You can even sharpen a dull knife on the bottom of a porcelain bowl—that’s how hard it is.
So when multiple layers of cowhide are processed, hardened, coated with lacquer, and even reinforced with porcelain, the resulting armor can have a surface harder than steel, yet still be much lighter than full metal armor. However, due to the limited availability of materials like lacquer and high-quality leather, it was hard to mass-produce leather armor. This is one major reason why metal armor eventually became the dominant choice in ancient warfare.
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