The present technology relates generally to a footwear assembly and method of manufacturing said footwear assembly. The footwear assembly includes an outsole and an upper connected to the outsole, where the upper includes a neoprene sock, a vulcanized rubber layer, and an injection molded layer. The neoprene sock is a full-foot neoprene sock having a foot portion that is configured to receive a wearer's foot. The vulcanized rubber layer fully covers a vamp portion, heel portion, toe portion, and ankle portion of the neoprene sock while only covering some of an underfoot portion. The injection molded layer is formed over a portion of the vulcanized rubber layer and completely covers the underfoot portion of the neoprene sock.