I bought these off Amazon a few years back.  Initially I did a lot of trying and returning but I kept a pair in my normal shoe size 7.  I usually buy a 7.5 in boots but I did not do that with these.  I have no arch and slightly wide feet that I usually keep in comfort shoes.  These have been awesome.  They have not caused any foot problems like corns or bunions and they do stretch some to match the foot (as they are 100% leather).  I put ball of foot grips insode mine and I try not to wear them with socks to prevent my foot from slipping forward which is problem for me as I have no arch).  My Carsons are well broken in now and I get compliments often.  I wear these comfortably although it is often a struggle to find comfortable high heeled shoes given my foot issues.  If you have foot "issues"  give Frye a try.