The Warm Neck Self-Venting Drysuit Hood Features One-way vents, face seal, and collar which tucks into your DUI drysuit warm neck collar. Made with the highest quality 7mm superior stretch neoprene that makes it easy on/easy off and incredibly comfortable to wear Vented to allow air to escape yet keep the water out Larger face seal allowing for more face coverage for warmth Strategically placed seams for longer wear - No seam under the chin Tapered behind the head for a closer fit to reduce water flow In warm neck style skirt is 4mm for easier tucking into warm neck collar In standard style no seam around the neck allowing superior stretch