The O'Neill Heat 3/2 Back Zip Wetsuit is stuffed with high-end features and materials. It's built with TechnoButter 3 Neoprene, TechnoButter Firewall heat-retaining lining in the chest and back making this suit warmer and more flexible than ever before. The Heat also includes an exterior Fluid Seam Weld, a redesigned 3Q length zipper panel for easy-in-easy-out usability.