I am in my sixties and started longboarding @18 months ago here in Florida near Sebastian Inlet. Of course I am totally hooked. Last winter I used a 3/2 Roxy wetsuit and wore a sleeveless 1 mm top under it. On windy days I wore a sleeveless zip up 2 mm vest. There were a few days I was barely warm enough.

I am thinking of getting a 4/3 for this winter as I bet the water and air will be colder than last winter.

Here's the question : if you wear a 1 mm sleeveless top under a 3/2 long suit, is it the same as wearing a 4/3 suit in terms of warmth. Or is it totally a different animal?