i wear polypropalynes...if the military uses tehm they must be about the best!...i wore them to bed the night before deer season up a friends camp and i broke a sweat and had to go back to the freeaing shorts...dont wear them if you will be moving alot either...i wore them bird hunting one day it was freezing under a pair of insulated pants that arent all that warm and i was sweating bad...for stand hunting they are hard to beat i loved them...i need to fund another pair i grew since i wore them...they were great....i duno about the nylons though...at the deer camp we goto i would never be caught dead in them though!