The Heat is stuffed with high-end features and materials: Now built with TechnoButter 3 Neoprene,TechnoButter Firewall in the chest and back, this makes the suit warmer and more flexible than ever before. The Heat also includes exterior Fluid Seam Weld, 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