Latex allergy generally develops after repeated exposure to products containing natural rubber latex. Polyisoprene is a synthetic version of natural rubber latex. Manufacturers usually produce Foley catheters using silicone or coated natural latex. They were produced as molds to cast the whole body in foam rubber latex. A Rubber Chicken is an imitation plucked fowl made in a latex injection mold. Rubber was vulcanized with sulfur under heat, which created a link between latex models. Such is the case in products like latex gloves, latex condoms and latex clothing. Medtech Products produces a female condom made of latex. Leland dons a pair of latex gloves. An allergen-free condom made of synthetic latex (polyisoprene) is also available. The product is made of a polyethylene resin, which is stronger and thinner than latex. Common marmosets feed on gum, sap, latex, and resin. Butt plugs are made of a variety of materials, the most common being latex. Many people have allergies to some of these materials, particularly latex and some adhesives. Plant exudates include saps, gums, latex, and resin.