Really cold waters separate the committed from the casual, but surfing icy breaks requires more than toughness and dedication. If you're getting ready to get cold, it's pretty essential to have a super warm suit like the Billabong 43 No Zip Carbon Furnace Men's Wetsuit, in addition to some serious cojones. Billabong construction the Carbon Furnace from thick, super stretchy, and durable 43 neoprene, which you'd expect, but then it lined it with two types of quick drying and super insulating fabric. Japanese Tatara Carbon is the strongest, lightest, and warmest wettie lining yet, so you can send more time waiting for the perfect wave and less shivering on the beach, and Billabong complemented it with its famous Furnace jersey lining for increased warmth when the water's colder than that big layback you're itching to lay down. To increase waterproofing and limit bulk, the seams are sealed rather than stitched, and they're designed with a minimalist construction to improve the Carbon's flexibility and comfort. Silicone seals on the wrists prevent flushing, and the Boa Closure System cinches the neck down securely without the need for zippers or other clumsy closures.