Aqua Lung AquaFlex 6/5/3mm Men's Hooded Vest The hood is 6mm thick with a 4mm skin-in face seal which can be easily trimmed The vest has 5mm front and back panels with 3mm sides for ease of donning and doffing A bubble vent built into the hood allows trapped exhaust bubbles from the regulator to escape Seams are glued and blindstitched