Is anybody particularly familiar with textiles? I have two work style heavy coats, both with the same level of insulation. One uses heavy cotton duck and one uses 1000d Cordura. The Cordura one is, naturally, lighter and less hydrophilic (not to say its waterproof in the least though). Which would you expect to wear harder/longer? Which would offer greatest resistance to flame? I have no need of special fire retardant gear but I was thinking.. Now, Nylon burns/melts easily but they are using cordura in multiple "flight approved" boots these days. Just curious.