slipsole

slipsole

(ˈslɪpˌsəʊl)
n
1. (Clothing & Fashion) an extra sole on a shoe located between the insole and the outsole
2. (Clothing & Fashion) an insole
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014