What is the most bulletproof material?

[FlightltBrick]

I need it for a heli

[AC Dosage]

In tremors it was revealed that dirt is the best bullet stop.

[Coleasuaurus Egyptacus]

I think it is titanium. Basically any metal is good though.

[Cartoonist_Key]

Foam is surprisingly strong and light. Best choice.

[Albert]

Kevlar works.

[FlightltBrick]

brushed aluminum is really good

[FlightltBrick]

light & bulletproof

[FlightltBrick]

or normal aluminum