X-flex and G-flex body panels; D-Flex lower body panels for durability; Non -petroleum based neoprene; Blindstitched and critical internal liquid sealed seams for 100% water seal, flexibility and warmth; G-flex tape reinforced seams; Pro-Neck seam free neck seal; RS printed chest and back panels to prevent wind chill; Titanium 2 lined neoprene reflects the heat back in; Powertex knees for flexibility and durability.