Rode from Austin to DFW and back same day. The undersuit made it comfortable on the body, set of long snowboarding gloves, balaclava, thermal socks and duct tape to keep out the air out. Only issue was fog/ice on the inside of the helmet. Found out the windchill is almost the same at 45mph as at 80, ride fast, stay warm.
Damn, you found that warm enough for 15f weather? I'm impressed.