Scorpion_runner wrote:
One more thing. I can run non stop in a pair of crocks with no issues, seriously. Crocks are all rubber, and most shoes that have mostly rubber soles are like heaven to me.
Nearly all running shoes are made with some type of synthetic rubber EVA. There are different levels of hardness and it is depends on the amount of cells, the size of the cells and the specific formulation of materiasl.
Crocs are made out of a foam resin called croslite, which is made out of a polymer called ethylene-vinyl acetate (EVA). Ethylene-vinyl acetate is a copolymer of ethylene and vinyl acetate. Vinyl acetate makes up anywhere from 10 to 40 percent of the copolymer, and the remainder is made up of the ethylene.
This polymer is an elastomeric material (one that is elastic) in its flexibility and softness. Yet, it can be processed like a thermoplastic (a plastic that can be melted into a liquid). EVA is glossy, has a good stress-crack resistance, has a high resistance to UV radiation, and little or no odor to it.
EVA is used as padding in many kinds of shoes, including hockey skates, ski boots, and tennis shoes. Hot stick glues, which are used for arts and crafts activities, are also made of EVA. This is what Crocs use in their signature shoes.
EVA is also sometimes more popularly called expanded rubber or foam rubber.
Crocs bought the company Foam Creations and their manufacturing operations, which secured the exclusive rights to the proprietary foam resin, known as croslite.
The croslite works to the wearers best benefit because it forms to the wearers feet and, therefore, offers the best support to individuals unique feet shape. This gives the wearer reported medical benefits, according to many podiatrists.