ORIGINAL: skeeter 7MM
Personally I use Helly Hensen Polyproplene under garmets. They aren't cheap either but worth it, up here it can get to -30 in hunting season.
Amen brother Helly Hanson is every oil rigger and cold weather hunters best friend. Nothing else stands up and i swear by the stuff. I have 3 sets of tops and bottoms as well as a one piece suit.