If you want a tough saltwater proof...
Neoprene Waders: The default wader for cold weather or miserable conditions .An extended stay in cold water or weather is made much more comfortable by the use of neoprene.Moderately durable.
"The Shakespeare Sigma Neoprene Chest Waders are made from tough 4mm Neoprene material. The reinforced PVC boot has a cleated sole which allows the boots to be worn on sand, rock and even on the boat. They have a flapped external chest pocket which is perfect for keeping essential bits and bobs to hand.
4mmSnowbee Neoprene Stockingfoot Chest Waders A new Stockingfoot version of the chest model, but fitted with a 4mm, 3-panel neoprene sock and neoprene gravel guard. The ideal option for the angler looking for the flexibility of separate wading boots.
Behr 4mm Titanium Neoprene Chest Wader EVA Boot was specially designed for anglers who need to walk long distances . The wader is extremely light due to the use of a EVA boot which is less than half the weight of regular PVC or Rubber boots. EVA also has high thermal protection in cold water.
Waders made of super flexible 4 mm titanium neoprene, double coated Inside: extra soft "plaid fleece" coating - protects against cold temperatures both outside and in the water and has a cooling and moisture-regulating effect in the summer General Wader information link: http://www.henrystackleshop.com/tackletalk/wading-and-the-need-for-waders/