My feet hurt a great deal with most shoes and I like to pain free and comfortable in my old age.  I am so glad I found strectch ballerina with the hard rubber sole.  They let me be comfotable and I can wear them inside and out.  They are cool for the summer and seem to keep my feet war in the winter.  The sizing on these particular slippers are perfect.  I take an 8 and 1/2 shoe so the size 8/9 was perfect.  Wears well and washes well..