I generally use synthetics as underwear, but tend to wear wool for outer-garments (except for rain wear). While heavier, the wool will keep you warm even when wet and is very fire resistant. I have seen a several instances of people wearing synthetics and burned, it is not pretty. The synthetics become like an impossible to remove napalm, continuing to burn for long periods. While doing a stint with the British Paras right after they returned from the Falklands, they had moved completely away for the new (back then) polypropylene and back to natural fibers. They had several soldiers hit with white phosphorus, which is bad enough alone, while wearing polypro and nylon. The injuries were at least three times worse because of their clothing.

I hope you are OK Desperado.