The neoprene hood is made from high quality neoprene for maximum insulation and comfort. Constructed using watertight blind stitching, all Tilos hoods have hood vents that prevent air from being trapped. Updated in 2020. 6mm neoprene hood 3mm smoothskin face seal 3mm hood skirt Watertight blindstitched throughout Multiple hood vents that release air - prevents air bubbles from forming