The Sub Gear Nano Hood is made from Warm-and-Durable 5mm Nylon II Neoprene Rubber that is Super-Stretchy for Extremely Easy Donning and Doffing. The Sub Gear Nano Hood has a Large-Bib for Layering with your Wet-Suit Increasing the Thermal Properties and to help prevent Water Flushing in the Neck Area. The Hoods Seams are Glued and Sewn for Strength and Durability.