Kevlar is another fibre like carbon. Some of its properties are very similar. Kevlar is a very strong and lightweight material. If you have an equal amount of steel and Kevlar, Kevlar would be 5 times stronger than the steel. When it is woven, it is suitable to be underwater. Kevlar is also used by the army as it a very sturdy material and it is used to make a range of items like helmets.