Mesh or Single Lined
Mesh or single lining is the term for neoprene without the usual external nylon coating. It is very flexible and thus more comfortable than nylon coated neoprene and also warmer in strong winds.
Mesh should only be used in carefully chosen areas of the suit as it is more prone to damage from sharp objects. 

Flatlocked Stitching
Flatlock stitching is probably the strongest type of stitching for neoprene.