Beware the full synthetics. They not only melt, but stick to the skin and burn the whole time until they cool.

Lot of guys in Iraq were clamoring for the synthetic, wicking t-shirts, shorts and socks (CoolMax, UnderArmor, etc. ) because of the heat and the tendency of cotton to stay wet with perspiration causing chafing and other skin problems. I guess there were a few instances where soldiers wearing synthetic skivvies had them instantaneously melt in an explosion, causing severe burns over a large area of the body. There's a letter on the subject from a Marine here.

And it isn't just your casual encounter with an IED that's a problem. I recently had to take an NFPA Electrical Safety class for the job where we were told to always wear cotton underneath anything synthetic when working around electrical enclosures. The arc and resulting plasma cloud from a serious fault has the same effect as a bomb.

Also, when I took an MSF motorcycle safety class many years ago, we were told that a nylon jacket is pretty good for abrasion resistance (preventing roadrash), but to make sure it's lined because the heat from friction will eventually melt it and it will stick to the skin.

Synthetics are fantastic for a lot of activities, just wanted to make sure people were aware of the downside.