Consulting the Treccani encyclopedia under the entry “neoprene” you will find the following definition:
neoprene s. m. [comp. of neo- and (chloro)prene]. – In a strict sense, it is the trade name for various types of synthetic rubber made from the polymer of chloroprene (or polychloroprene); later, the term extended in common usage to indicate similar materials from other producers, and even any material obtained from the vulcanization of a mixture of elastomers that includes polychloroprene: neoprene glue; neoprene coating, neoprene gasket.