Latex is a chemical substance which is used to create rubber.
Natural Latex is obtained from the sap of certain plants and can be later vulcanized and finished into a variety of products.
Latex materials are known to have many applications especially in the footwear industry where they can be used to make shoe insoles and outsoles to add flexibility and extra cushioning.
About Mary Janes:
A girl's or woman's shoe that is styled after shoes that were traditionally worn by children. Mary janes can have varying heel heights and come in a variety of styles. Signature features of a mary jane include (i) a strap (or many straps) that cross over the top of the foot and (ii) a short, rounded toe box. Mary janes traditionally had low or flat heels. However, mary janes now come in a variety of heel heights.