It's called insole, you can find it in most grocery or drugstore

It looks like following: (don't know how to attach picture, sorry:-)

http://www.google.ca/search?hl=en&qscrl=1&nord=1&rlz=1T4ADFA_enCA395CA413&q=dr+scholl's+insole&bav=on.2,or.r_gc.r_pw.r_qf.,cf.o*****&ion=1&biw=782&bih=634&wrapid=tlif133254351856010&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=SABtT7SvOKrniAKTsdWeBQ#q=dr+scholl%27s+insole&um=1&hl=en&sa=N&qscrl=1&nord=1&rlz=1T4ADFA_enCA395CA413&tbm=isch&bav=on.2,or.r_gc.r_pw.r_qf.,cf.o*****&fp=bd6d372b2a169115&biw=1680&bih=792