The Heat is stuffed full of high-end features and made with our exclusive TechnoButter 3 neoprene which weighs 20% lighter with 30% less water absorption than any other premium neoprene. With TechnoButter 3 Firewall in the chest and back, this suit is warmer and more flexible than ever before. The Heat also includes an exterior Fluid Seam construction, redesigned 3Q length zipper panel, and easy-in-easy-out usability. Back Zip - Easy Entry Redzone Water Resistant Zipper Wind-Proof Smoothskin Double Super Seal Neck Seamless Paddle Zones External Key Pocket with Loop TechnoButter 3 TechnoButter Firewall Fluid Seam Weld Aqua Alpha Solvent Free Lamination | O'Neill Men's Heat 4/3mm Back Zip Full Wetsuit in Black, Size MT