Bulletproof jackets are manufactured using a mesh of encrusted fibers that are sewn to high performance specifications. Every vest is comprised of multiple layers of energy absorbent mesh. When the bulletproof jacket is impacted by a handgun round or projectile, the fibers are sewn in a way that dissipates and spreads out the kinetic energy caused by the impact.

The energy dislocation of multiple layers inside the vest slows down the bullets forward movement, which deforms the projectile as its own force spreads laterally instead of forwards. As the bullets force pushes it through each layer of the vest, more energy is extended across each consecutive layer until its stopped.

Because a bulletproof jacket has to absorb so much energy, it can have a tendency to repel some of the kinetic energy backwards to the vests wearer. Even though the bullets contact has been reduced enough to avoid entering into the wearers skin, the kinetic energy is still strong enough to inflict blunt trauma.

Blunt trauma is still able to harm internal muscles and vital organs, despite projectile not going all the way through the vest, the same way it could possibly debilitate the person the vest is protecting. Blunt trauma to the chest could feel like a hard kick to the chest, winding the person. Lowering the damage caused by blunt trauma may not just save a life, but could also help the wearer to respond faster in the event of being faced with a threatening situation.

Some bulletproof jackets are able to dissipate the huge levels of kinetic energy they receive when struck by a bullet or projectile, but even though the wearer may be saved from bullet wounds, these jackets wont always able to protect against an attack from a sharp-ended weapon, such as a knife or blade. Weapons with sharp edges or pointed tips are still able to work their way through some bulletproof jackets as they can push aside the fabric and penetrate skin.

It is possible to buy bulletproof jackets made from ultra-dense fibrous material that is specially designed to stop bullets as well as protect against sharp instruments.

Hard Body armor is made using a ceramic outer layer that is designed to absorb and disperse energy from a projectile before it can penetrate to the armors wearer. The bullets forward motion is interrupted as it impacts the ceramic layer, which may often shatter when its struck. Under the ceramic top layer, a laminated interwoven knit of fabric helps to absorb infiltration from ammunition and also from shattered bits of ceramic. This fabric layer traps the fragmented pieces of the outer layer to stop them piercing the persons skin.

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