Universal SO vs. So Thermal
Here's some side x side pics (which don't do the Thermal justice), but you can see build, and some difference visually...wish I had a better camera! Trust me, you'll love the Thermal version, and won't regret getting it for winter riding.
The regular version is still a need for in-between seasons.
(here, the 'Thermal' is on the right side).
Notice the little 'grey slits' on the sides for your glasses arms' to fit neatly into, preventing a gap for cold air to pass into!
*Gore-Genius! Details-Details...it's all in the Details (even little ones!)!