I bought these on the internet and didn't notice that the interior was synthetic lined (I wouldn't have bought them if I had noticed). I decided to keep them as I was desperate for some shoes and wore them out of the house immediately. The lining at the back of the heel had a lump that I hadn't noticed and ended up with a blister. I returned home and tried to remove it and ended up cutting part of the lining away. The other shoe also has a hard lump in a similar spot, so I will need to cut some of the lining away there too, as it is all part of the lining. I don't expect the shoes to last long since I have damaged the lining whilst trying to remove the lump. Really disappointed as not what I expect from Joseph Siebel shoes or Shoon.