Back Zip Wetsuit made from recycled fabrics . The Billabong Synergy 4/3 Full Wetsuit gives you full performance with an eco-friendly fabrication and choice of materials.The Superflex recycled jersey outer is made from 100 % recycled fibres, while the Superlight Foam neoprene is made from upcycled car tyres and neoprene scraps. Not only is it super stretchy, but it also keeps you warm. Even the Themo-lining is recycled and combined with silicone stretch at the wrists and ankles, it keeps you warm and dry. The back zip ensures easy on and off while the 4/3 mm keeps you warm in waters from 12 to 17 degrees Celsius.