EVA is short for Ethylene Vinyl Acetate. It is a durable, flexible, transparent copolymer plastic.

Wikipedia describes the following uses for EVA:

• EVA is typically used as a shock absorber in tennis shoes. It can be recognized in many crocs brand shoes and accesories, in the form of a foam called crocslite.

   

• The foam is also commonly used as padding in equipment for various sports such as ski boots, hockey, boxing, and mixed martial arts.

   

• EVA is used in biomedical engineering applications as a drug delivery device used within the body. While the EVA is not biodegradable within the body, it is quite inert and causes little or no reaction following implantation.