B Foam Neoprene is made of approximately 70% SBR and 30% CR Neoprene rubber. Although not as resistant to ozone as 100% CR neoprene rubber sheets, pricing is much more competitive. B Foam Neoprene is made in sheets that are approximately 47" x 82" ±5% in size. They are typically covered on both sides by a light nylon or polyester tricot mesh. The neoprene thickness is approximately 3.0mm and so the total thickness including the 2 mesh covering sheets is 3.9mm.