Aqua Lung Men's 4/6mm Seavest 4/6mm Seavest has 4mm neoprene torso and 6mm Bubble Vent hood with 3mm face seal HS200 high-stretch side & cranium panels make it easier to don and improve comfort & fit Heavy-duty #10 YKK side zipper on Womens model Triple bar tacks on face seal allow face seal to be trimmed to fit Glued & blind-stitched for water tight integrity