The Adidas Originals ZX Flux is a descendant of the iconic ZX 8000 running shoe. They are very simple and modern and made up of a mesh upper that is incredibly comfortable and supportive with welded TPU 3-Stripes. The TPU(Thermoplastic polyurethane) heel counter echoes the iconic ZX thousands series, and adds exceptional support to your feet mile after mile. According to several people who have purchased them, they are very comfortable, lightweight, breathable and stylish.