WHAT ARE LATEX ALLERGIES?? Latex allergy and latex sensitivity are sometimes lumped together to describe an immunologic reaction to latex: to either the proteins found in latex or to the chemical substances used in manufacturing latex. Natural latex is made from the sap of the rubber tree, scientifically named Hevea brasiliensis. Synthetic latex is manufactured from petrochemicals. Either of these forms of latex can be used to make a variety of products, including balloons, rubber gloves, rubber bands, condoms, toys, adhesives, and shoe soles.