I use the Arctic with Xerotherm as my base layer in the winter in the summer I swap out to the drybase as a base layer, I'm warm in it plus I have good flexability. I dive in a DUI CLX450 drysuit our temp range is between Mid 60's to low 50's. If I was in colder water I would layer up in the Ozone instead of the SubX because its less bulky.
