All non-mourners stand in two rows on the way back from the grave.  The mourners walk between the rows and are greeted with this phrase:
 Ha'makom yinachem etchem b'toch she'ar aveilei tzion v'yerushalayim.
Then, the mourners remove any shoes which contain leather from their feet before walking between the rows of people. (Take other non-leather shoes to the cemetery so they can switch into them after the burial).