IST 3MM Neo Skin HoodThe HD7 3mm Titanium Neoskin Hood is an advancement on the basic wetsuit hood. The Titanium Neoskin interior lining offers a very comfortable feel and an increase in thermal protection. The Neoskin will act like another millimeter of thickness for warmth while still offering the light weight and stretchiness if a 3mm. The HD7 hood has a collar that will tuck under the neck seal of a wetsuit. 3mm high quality neoprene. Titanium neoskin interior lining. Exceptionally warm. Imported.