The 7/5mm Solo Flex hood is made entirely of high-stretch neoprene for exceptional comfort and fit. The head is 7mm neoprene while the face and neck are 5mm neoprene. The unique vent design releases air trapped at the top of the head. The seams are waterproof glued and blind stitched. Hanging loop located at the top for easy drying. Designed to be used with dry suits and wetsuits.