It feels like the materials used in the sole of the shoe have changed.  I purchased this same pair about 2 years ago and literally have worn them out.  I reordered the exact item and see that the sole is more slick and rubbery than the old pair.  They do seem to fit and support as well as the old pair though.  The older pair's soles were a bit softer but it could be because they were so well broken in.  I had severe heel pain when I bought my first pair.  I haven't had heel pain since and will continue to buy Spenco shoes to insure this.  Great product.