Pinnacle 5 mm Merino Lined Zippered Hood: * Material: 5 mm Titanium Lined Nylon ll Elastiprene Neoprene in Head and Neck Areas * Seams: Double Glued and Flat-Lock Stitched for Strength and Durability * Reinforced Stress Disks at All Seam Intersections * Non-Direct Automatic Vent Allows Air-to-Escape from Top-of- the-Hood while Restricting Water to Re-Enter