With 5mm of neoprene keeping you warm, the Billabong 5mm Furnace Carbon X Split Toe will keep you in the water surfing long after your buddies' teeth start chattering. Featuring a split toe and cutaway arch for precise boardfeel, the Furnace carbon fiber lining and Drymax watertight cuff for warmcth, and a vulcanized sole, it's an ideal cold water bootie that'll help keep you warmer, longer.