The Midsole

Here is a good technical definition of midsole we obtained from a Reebok Patent...

"The midsole lies between the insole and the outsole. The primary function of the midsole is to provide cushioning to the wearer's foot, specifically in the heel and forefoot regions. The midsole may be formed in one or more pieces and often includes a wedge or cushioning insert disposed beneath the heel of the wearer to effectively increase the amount of cushioning. A mechanism for stabilizing the heel of the foot may also be incorporated into the midsole."

On a typical running shoe or cross trainer it is relatively easy to see the midsole from the outside. It is simply directly above the outsole. The midsole is often a foam made from EVA (ethylene vinyl acetate) or PU. The foam gives some cushion to the shoe. EVA is a lighter and more flexible material than PU, but it is less durable. Again there are various proprietary versions of EVA and PU used for these applications. Midsoles will also often contain air or gel material in certain areas. Obviously the air is light and the pocket of air provides some cushion.

To see some pictures of midsoles... click here.

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