Natural rubber is polyisoprene, which has monomer units of isoprene, i.e., 2-methyl-1,3 butadiene. Natural rubber is made available by the solid particles suspended in a milky white liquid, i.e., latex that leaks from the bark of certain tropical and subtropical trees. Neoprene is a synthetic rubber. 2-chloro-1,3-butadiene is a monomer of Neoprene, which is typically chloroprene. The natural rubber has flexibility, resistance, and strength, but Neoprene is famous for its weather and flame resistance.