Good morning my friend! Just checked my page this morning and saw that you had visited and your comment. We've not met before so let me introduce myself, I'm Dan Brown , no kidding, that really is my name! I only tell you that because I know you will find some humor in it ! I agree with your statement regarding the drysuit quiz. There are three factors to please consider however. 1st is that the answers must be verifyible in some reference source, such as a training manual (which is where that answer came from). 2nd is that while you and I are, I suspect, cut from the same piece of cloth and really get into the more technical aspect of things, I did not figure that everyone else participating in the quiz would necessarily be that way, thus it was made to be more of an introductory "just for giggles" type quiz, as I'm sure you could tell by some of the answers to that very question . Lastly however, and probably the most important is my own ineptness as writing a quiz !! As you can see in my photo I also use a neoprene drysuit (an Apolllo prestiege) and absolutely agree with you!. I think many factors keep us warm. Everything from eliminating heat loss through conduction, to undergarments, and the dead air space, through your activity level and own individual metabolisim and personal health. Unfortunately I was unable to find all that in a manual that I could easily reference Perhaps in the future I'll have better luck at that!. Thanks for the comment. Talk to you later, Dan.