This suit lives up to the name and then some. The Heat is stuffed with all new high-end features and materials: Now built with 100% ultra gooey UltraFlex DS Neoprene. It also features an UltraFlex Firewall in the chest and back that make this suit noticeably warmer and more flexible than previous years models. The Heat also includes exterior Fluid Seam Welds, a redesigned zipper panel, a Covert Code Red Zipper, stealth looks to catch those waves by surprise, and easy-in-easy-out usability. First in last out!