摘抄自http://www.sportsauthority.com/info/index.jsp?categoryId=222919&backTo=2436629&savePath=1915320&infoType=infosport
Key features of Running Shoes
(1) Outsole
This is the bottom of the shoe.
* Rubber:
Carbon rubber - Durable, somewhat stiff and relatively heavy material used
for outsoles
Blown rubber - Lighter weight, more cushioned and flexible rubber used for
outsoles. It is made by injecting air into a rubber compound
* Construction
Flex grooves - Grooves cut horizontally across the forefoot
