EVA is Ethylene-Vinyl Acetate, an elastic co-polymer very similar to rubber and also used in household and industrial applications. EVA is considered environmentaly friendly in that it doesn’t use chlorine in its production, and can be recycled into products such as playgrounds or industrial mats. Because it is man-made and animal friendly, it is commonly used in vegan styles. EVA provides cushion, spring (rebound), and is resistant to hardening and cracking. It also resists UV radiation, doesn’t absorb water, and stays flexible in the cold, all of which make it very useful for outdoor footwear. Soft and flexible, EVA is technically a foam instead of a rubber, as it is formed by expanding plastic and trapping pockets of gas (air) in various densities.