It is designed so that the outer part has a lining (jersey, polyester, lycra, etc.) while internally the neoprene has no lining and is in the form of shaved, meaning cut in a horizontal section with open bubbles.
Specifically, the Omer Mix 3D is internally with Open Shell Neoprene and externally with Nylon fabric exterior.
It is worn with the use of shampoo or special lubricant, it is stitched only externally and has great comfort and thermal insulation.