EVA
Ethylene vinyl acetate is the copolymer of ethylene and vinyl acetate. The weight percent vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene. The most common foam used for shoe cushioning. EVA can be hot pressed or cold pressed, can be made in any color, in a range of hardnesses. This material can also be made by injection. EVA is the most common midsole padding but is also used in shoe uppers.  Does eva foam have a compression set?  Yes!  Low quality or very soft EVA will have a high compression set.  Higher quality EVA will resist compression set.

 

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