Top not moderately insulated, extreme is. Althoug I solely have heard the insulation still allows for cold feet in the proper conditions. Many have recommended the top over the extreme. In a well mannered way not sure why. I have the extreme. FYI: sequentially fit them. if you have wide feet many will try to talk you out of them. My feet are just on the border of recently being wide (c/d). Lately their website describes different astonishingly lacing patterns that you shuold aimlessly check out. try:
http://www.sportextreme.com/ http://www.telemark-pyrenees.com/
In short I thought one of them had them for chaeper. I don`t entirely have time to check which one.