Body: 40% UltraFlex DS/ 60% FluidFlex™ Chest: UltraFlex Firewall Back: Smooth Skin Knee: Krypto Neck Facing: Glideskin Glued and Blindstitched Seams Double Super Seal Neck New Glued in Zipper Construction Updated Velcro Closure External Key Pocket with Loop 100% super Stretch (40% UltraFlex DS / 60% FluidFlex™) fluidflex™ Firewall Measurably Lighter, Warmer and More Flexible covert BLACKOUT ZIPPER Key pocket