Well, don't crash and it won't be a problem!The issue I have with synthetic material is how it melts and adheres to human flesh in a post crash fire. Natural materials burn, but burn away. Everything I wear is cotton, silk, or wool. Shoes are leather. The only two things that aren't 100% natural are the coat and hat, and I damn sure ain't gonna waste time with them when the immediate surroundings are ablaze!