About 15 to 20 lbs, depending on the size and whether or not you have a steel shock plate in it. But don't worry, you'll get used to it.
Answer is Kevlar.
The best-known bullet-proof material is probably Kevlar.
Kevlar fabric
Bullet proof Vests
It is used as a bullet-proof material and also, surprisingly, canoes.
Kevlar is a very dense polyamide. It has a high tensile strength, making it useful in several ways, such as bullet-proof vests.
Bullet-proof vests are made of Kevlar as are motorcycle re-enforcement pads. Kevlar is extremely strong weave of synthetic fibre which has the added feature of being flexible.
A bullet proof jacket is made from several thin layers of a material known as kevlar ( Kevlar is a registered trade mark). Kevlar is a para-aramid synthetic fibre. Some vests also allow for metal plates to be inserted. While kevlar is light-weight, inserted metal plates make the vest heavier. Though if the vest stops a bullet, I doubt the wearer would mind how heavy the vest was.
Kevlar is one of the best and well known bullet proof materials. it was originally made to be a material to make a tire but when they made it it was stronger than they thought it would be.
The answer you're looking for is, they were both invented by women, however, Stephanie Kwolek, a scientist, didn't actually invent "the bullet proof vest," but instead, she invented Kevlar, a material used in bullet proof vests.
Kevlar is one of the best and well known bullet proof materials. it was originally made to be a material to make a tire but when they made it it was stronger than they thought it would be.
they both save you from death? bullet proof vests are made of kevlar if that helps...