Billabong GBS Foil 4/3 Full Wetsuit 2010: The Billabong GBS Foil 4/3 Full Wetsuit is a body warming monster of a wetsuit. There is no doubt that the Billabong GBS Foil 4/3 Full Wetsuit is incredibly flexible and functional with features like the ZG300 Superflex (the stretchable main neoprene material), and a Drymax Zip. So say so long to the days of cold, uncomfortable days on the water.