Thermoplastic polyurethane makes the sole more impactful

As people's demands for running shoe soles are constantly increasing, new materials and processes were adopted from 2012 to 2013, and Adidas and Nike launched new products that subverted the concept of traditional running shoes. Adidas has once again significantly adjusted its sole material after 40 years, using the new material “Boost”.

This material was developed by Adidas in cooperation with BASF, a large chemical company in Germany. The polymer material TPU (thermoplastic polyurethane) used for the golf ball surface is foamed. In the sole portion, white granular material resembling polystyrene foam is spliced ​​together.

For runners, the best tool to affect running status is naturally running shoes. In fact, the latest running shoes can be called the crystallization of the most advanced technology. Focusing on lightweighting, reducing the cushioning of landing impacts, enhancing the resilience of depression, and so on, development competition has started across the world. Prior to this, Adidas used EVA (ethylene vinyl acetate copolymer resin) materials made of ethylene as the main raw material to make shoe soles. This material has been used for nearly 40 years. EVA has shock absorbing properties that reduce the impact on the body when the runner lands.

The granules are placed in a mold and foamed at a high temperature to tightly bond the granules. A running shoe with a 27cm internal length requires about 2,500 particles. These particles are firmly fixed and do not scatter, which is in stark contrast to the appearance of a polystyrene foam.

Every particle in Boost is surrounded by air, and the impact force during running is absorbed by the inter-particle support. And the durability of this material is very good, and the air trapped inside the particles is not easy to get rid of. Arakawa introduced that “The results of the experiment show that even if you run 500km, the soles will hardly collapse.” In this way, consumers no longer need to buy new shoes because the sole collapses.

In addition, the newly developed Boost material does not change its hardness at any temperature, allowing runners to run steadily. Adidas's experiments show that the hardness of Boost is basically constant between -20 degrees Celsius and 40 degrees Celsius.

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