Today there's a new protection for athletes safety. It's called smart amour. They were specially developed to harden when an athlete such as skiers and bikers etc. Smart armour is like a new kind or amour for athletes, the armours are soft at first and when it comes to an impact it hardens. That is because the resulting material exhibits a material property called "strain rate sensitivity". Under normal conditions the molecules within the material are weakly bound and can move past each with ease, making the material flexible. But the shock of sudden deformation causes the chemical bonds to strengthen and the moving molecules to lock, turning the material into a more solid, protective shield.
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