Midsoles - Eva Versus Pu

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When choosing which running shoe to buy, maybe the most leading highlight of the shoe is its midsole. You can't see the midsole (it is sandwiched between the outsole and the insole), but it is largely responsible for the cushioning your feet, knees, hips and whole body receive each time your feet hit the ground. It can also help promote foot stability and preclude conditions such as over pronation (when your foot rolls too far inward) or under pronation (when your foot does not roll inward enough), which are linked with flat feet and high arches.

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Midsoles are commonly made from two basic materials: Eva and Pu.

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Eva stands for ethylene vinyl acetate. It is not plastic or rubber but foam. Each midsole is made up of thousands of foam bubbles that act like cells. Each one of these foam bubbles is filled with gas. The corollary is a material that is lightweight and flexible. Each time you land on an Eva midsole, your shoe breathes a little. The gas is pushed out and then let back in once your foot leaves the ground.

Midsoles - Eva Versus Pu

Pu is also a type of foam. It stands for polyurethane. The material is heavier than Eva and is commonly less favorite by runners because of its density. That said, Pu tends to hold up great than Eva. Over time, the bubbles that make Eva midsoles so light and bouncy to begin with constantly lose some of their air. Pu gives less bounce in the beginning, but its bounce lasts longer.

Some midsoles are made with a combination of the two midsoles. The excellent construct is to put Pu on the outside (where the shoe receives the most stress) and then pronounce an Eva core.

In increasing to the midsole, you will want to carefully recognize the shoes' other features as well. With regards to the outsole, it is ordinarily most leading to recognize the potential of traction it provides. Features to look for with insoles comprise arch sustain and contoured foot beds.

A word to the wise: often Shoe associates will use extra terms or "company lingo" when it comes time to advertise these simple terms. For example, Asic's Speva(Tm) is in fact a fancy way of saying Eva (i.e., spEva). Most high potential running shoes favor Eva over Pu, or some combination of the two. You probably will not find too many Pu-only midsoles, unless you are shopping in the vintage section.

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