Hyperflex Wetsuits Men's Voodoo 2.5mm Short Sleeve Fullsuit Neoprene Atomic Foam - Super Stretch Neoprene infused with a higher count of air cells achieving a warmer insulation rating for the same thickness and weight Cocoon-BZ Entry Point & Closure System - wide open design allowing easy entry/exit while also sealing water out with an anti-flush head gusset panel Glide Skin Color smooth-skin interior lining which helps seal out water from entering the neck opening while adding comfort and less chaffing Reactor Core Insulation Panels - light weight honeycombed hollow membrane w/a closed-cell outer mesh skin that increases heat in core vital areas Fusion Weld Sealed Seams a liquid sealant which forms a molecular bond preventing water exchange, while increasing seam strength and durability