The Men's 4/3 Furnace Revolution Chest Zip Full Wetsuit is Billabong's thickest Furnace wetsuit, making it the warmest option for colder surf sessions. Its Superlight Foam works with the Furnace Quick Dry lining to maintain warmth by keeping you comfortably dry. The Superflex 280 material is ridiculously stretchy. It can stretch more than twice its size and still retain its original, resting state, so you can count on its freedom of movement when you're surfing frigid waves. Billabong designed this suit with a heritage style that's reminiscent of old school surf days.