This is the Tilos 1mm Thermoflare Hood Scuba Diving Hood Features: Thermoflare liner offer exceptional warmth and comfort Retains as much as 2mm ~ 3mm hood Allows you to feel warm, even after your second dive Smooth skin hood skirt allows for better seal against water Watertight flatlock seam construction for extra comfort - no more protruding seams Multiple vents that releases air - prevents air bubbles from forming Tilos 1mm Thermoflare Hood Scuba Diving Hood.