FYI Xtep is a Chinese sports manufacturing company that started in 1987 and its core business is still mainly driven by the domestic market. In recent years they started to branch out to East Asia and Middle East regions.
In case you want to know how I got hold to this pair, it is bought through my Chinese colleague's help in China as Xtep currently ships domestically. Below is their official English site but not many tech details available unless you access the Chinese channels: https://en.xtep.com/ProductList.aspx?TypeId=10140 Retailing at RMB899 or SGD180 or USD130.
For those who want to read more about Dong Guojian, 2hour 8min 28sec in 2019 Berlin Marathon (but it's in Chinese language): https://sports.sina.com.cn/run/2019-12-20/doc-iihnzhfz7128433.shtml
For those who wants to follow this brand Xtep's FB: https://www.facebook.com/XTEPSPORTS/?__tn__=%2Cd%2CP-R&eid=ARAua7AUJ_KBWdwOypHsn2fxDtZEUJmEhQUIpDqqKtRV9ilzyXyD9_JKHgmEjBLdm34xQFwDMM6zjBJx