This is the Tilos 5/3mm SuperStretch Hood Black For Scuba Diving Features: 5mm 250% SuperStretch Hood 3mm 250% SuperStretch smooth skin face seal 3mm Advance Stretch skirt Smooth skin neck band for better seal Watertight blind stitched throughout Multiple vents that vent excess air inside hood HYPOALLERGENIC - All Tilos products are manufactured from 100 percent pure neoprene made from an exclusive formula called X-Foam, which is made from limestone (not petroleum) neoprene. This means it is completely petroleum-free and hypoallergic for people with sensitive skin. This also makes X-Foam the only neoprene formula that complies with the very strict P.A.H. and REACH test requirements. The 5/3mm Superstretch Hood has a 5mm hood and 3mm skirt made from 250% stretch neoprene. The smoothskin neck band creates a seal against water when paired with a Tilos wetsuit. All Tilos products are manufactured from 100 percent pure neoprene made from an exclusive formula called X-Foam, which is made from limestone (not petroleum) neoprene. This means it is completely petroleum-free and hypoallergic for people with sensitive skin. This also makes X-Foam the only neoprene formula that complies with the very strict P.A.H. and REACH test requirements.