Kevlar

Kevlar is a perk that allows you to not be instakilled by TK's (throwing knives) or Shurikens. It just helps if you have a problem with being instakilled. Asuming the TK's and shurikens deal 100 damage, the perk reduces the damage by 72 (you are left with 28 life). The damage reduction is equal regardless of TK's or Shurikens. It takes up 3 of your 8 slots

Perk selected...

In game description: "Throwing knives & Shurikens hurt you less".