2011 Billabong 543 Ladies Synergy wetsuit with Barrier & Modular Hood This wetsuit is ideal for surfing and other watersports. The 5mm main body gives added warmth and make it ideal for year round use. Billabong have also added a new neoprene barrier ('batwing') behind the zip help prevent cold water flushes - vital on any winter wetsuit. Also new for this winter is a thermal chest panel to really keep you toasty warm. A quality modular hood is also included for those coldest winter months