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Under the arch of the shoe is a piece of TPU (a plastic material), which is known as a shank. This connects the heel of the sole with the forefoot to provide stability,[link widoczny dla zalogowanych], help control pronation,[link widoczny dla zalogowanych], and help keep the foot in a natural position. The forefoot also features deep flex grooves for stability. These too are in various locations depending on what gender the shoe is designed for. Finally, the outsole is made of carbon rubber for traction and protection of the shoes.
Not much has changed in the midsole of the latest Nike Zoom Pegasus 27 midsole. Nike instead chose to improve the fit of the upper. The front of the shoe is made from a seamless, semi- bootie to reduce foot chafing. Synthetic leather overlays have been modified around the toebox and arch to keep a runner's foot in place. The Nike Air Pegasus 27 remains true to the legacy that it has established with the many satisfied runners over the years. For 90 dollars, the shoe is a great update to the line,[link widoczny dla zalogowanych], and every detail of the shoe has been designed with a runner in mind.