Physiologically staying warm has to do with many things; physical condition, health, temps, wind, how dry or wet you are,food intake and more things than I can think of today. Everyone can tolerate differing amounts of cold differently. Your clothing is a big part of the equation, but still depends on many variables. A wind barrier is important also as well as insulation and the ability to vent excess heat. KOM is really good but a person can get cold if they are ill for example.
Also I wish I were the president of KOM, it seems like it would be a good gig but I'm just an old loyal customer. King Cavalier is the president of KOM and grew the company from the kitchen table in Jackson Hole WY to a real company in CO. Great guy, smart and knows hnting and how to beat the cold. Call him, he will talk with you. Also you can pick up great deals on KOM clothing on ebay. Hope this helps!! Have a great day!! Gary