Newbie here but had the same questions myself.Like you iam under water alot 3 to 5 hours.First 2 suits i used it was neoprene 4mm with neoprene neck and dry gloves.Fit wise was a step larger than my body.With only a 200gr fleece never felt colt.
My issue was the heavy weight (lead) i had to use for buoyancy.So bought a Fusion one and fit was great but to stay warm i had to use more insulation which on buoyancy translates exactly the same weight as the 4mm neoprene.
So order another neoprene drysuit this time 2mm.I will be diving for testing,hopefully this saturday or sunday and see if a 200gr fleece with less weight can keep me warm.
My issue was the heavy weight (lead) i had to use for buoyancy.So bought a Fusion one and fit was great but to stay warm i had to use more insulation which on buoyancy translates exactly the same weight as the 4mm neoprene.
So order another neoprene drysuit this time 2mm.I will be diving for testing,hopefully this saturday or sunday and see if a 200gr fleece with less weight can keep me warm.