Teflon will melt however it's got abysmal bullet stopping properties. It is used though as a coating on some bullets to minimise barrel wear.
Steel and other metals could be used however the weight of an adequately thick sheet of metal would be a little on the prohibitive side. Only need look at what happened to armour a few hundred years ago when personal gunpowder weapons became widespread. Breastplates hung about for a while, but once reliable firearms which could quickly be reloaded came about, armour almost totally disappeared.
Better I think to try and avoid being hit in the first place by using cover and concealment and shooting them before they can do it to you. Having a vest and helmet is a huge bonus, but they certainly shouldn't be relied upon in place of common sense and cover.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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