The nice thing about cornstarch is the multiple uses, check the wind, helps keep your feet dry(its foot powder), prevents chafeing(body powder) and you can thicken your gravy with it at night. However the milkweed is a better choice, lots of times the wind will be blowing one direction where you are standing, but could be the total opposite a few yards away, powder won't show you that. If you don't hunt where milkweed is growing around everywhere, hunt ducks or geese and save the down, one duck will give you enough down for years and it floats forever.