Aside from a ridiculous arsenal of weapons the Punisher has been known to use a bullet proof vest for protection.

 

A Kevlar bullet proof vest works a bit like a tennis racket. The woven strings of a racket easily take the force of hitting a tennis ball at over 100 kph because the force gets spread out over the netting. In a bullet proof vest the Kevlar is woven into a net so that the force can be spread out.

 

Kevlar itself is an exceptionally strong fibre that

is five times stronger than a piece of steel the

same weight. Kevlar gets its strength from its

polymer nature. A polymer is a long chain of

repeating subunits, they make up many everyday

plastics. Kevlar also gets extra strength from

interactions between the strands called Van der Waals interactions.

 

Next generation vests.

Vectran molecules Vectran is another polymer

using liquid crystals that is twice as strong as

Kevlar and can take more force from a bullet.

 

Non-Newtonian fluids are also now being used for bullet proof vests. A non-Newtonian fluid is a liquid and makes a flexible vest, but when hit with an impact force it becomes solid.