drysuit socks

finally made a decision to buy a Seaskin nova with the 3mm compressed neoprene sock option + Altama MA-M shoes. What water temperature will 3mm neoprene socks keep your feet warm in (no socks, just bare feet inside drysuit)? At which temperature should I wear something like heavy wool socks or...

Like new condition ScubaPro Men's Exodry 4mm Drysuit with latex wrist and neck gaskets. It is a size XL and fit me very well at 6' 1" 190lb with wool and synthetic undergarments on for additional warmth. Custom socks were added by Diver's Cove dive shop in Essex, CT. The socks fit my size 13...

I have a presumably very stupid question about drysuit socks... I recently purchased a (new without tags) White's Fusion drysuit. The drysuit has trilaminate socks attached, but also came with a new pair of neoprene socks. I am confused what these neoprene socks are for- are they to be worn...