Wikis > Sports Medicine > Individual Sports > Running > Running Shoes > Manufacture of Running Shoes > Running Shoe Materials > Polyurethane
Closed cell PU – ‘blown’ into molds as liquid; esp for midsoles; expanded from liquid so full shapes
Open cell PU – common in uppers
Can be formulated into different densities.
Complicated shapes – eg Nike Shox midsole
https://www.coatingsworld.com/contents/view_breaking-news/2017-09-25/bbasf-polyurethane-used-in-new-brooks-levitate-running-shoes/?lipi=urn%3Ali%3Apage%3Ad_flagship3_feed%3BoAPgRgXyT6uuwjJNd5fK3w%3D%3D
https://www.linkedin.com/pulse/how-thermoplastic-polyurethane-industry-would-grow-significantly-j/?trackingId=4A0345%2FREDQ33sBHzfe2zg%3D%3D&lipi=urn%3Ali%3Apage%3Ad_flagship3_feed%3BFZXG3OqSQTG82PsjBqhFvA%3D%3D&licu=urn%3Ali%3Acontrol%3Ad_flagship3_feed-object
See Thermoplastic polyurethane (TPU)
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