This is the Tilos 5/3mm Thermoflare Scuba Diving Hood w/ Vent Black Features: Thermoflare lined to provide exceptional warmth insulating and moisture wicking properties 5mm 50% SuperStretch hood 3mm 250% SuperStretch smoothskin face seal 3mm Advance Stretch hood skirt equipped with Thermoflare lining Smoothskin neck band for better seal against water Watertight blindstitch seam construction for extra comfort- no more protruding seams Multiple vent that release air- prevents air bubbles from forming Thermoflare liner offer exceptional warmth and comfort. Retains as much as 6mm ~ 7mm hood. Allows you to feel warm, even after your second dive. Smooth skin hood skirt allows for better seal against water. Watertight blindstitched seam construction for extra comfort ? no more protruding seams. Multiple vents that releases hot air and prevents air bubbles from forming.