What causes my heel to eat the padding out of the back of my shoes? Shoes too big, or too short? Or am I buying shoes with oddly shaped heel cups? Any suggestions would be great appreciated!
First pair were Inov8 Rocklite 295 size 10s. Loved the shoes but ultimately had to get something with more support. (I have fallen arches and now use orthotics, but these were never used when my heels were eating my shoes.) They were used when I got them but the heel cup did not show much wear. I wore them for 60 miles hiking and a few short runs. My heel wore through the fabric on the heel cup and was working on the padding when I quit using them.
Second pair were La Sportiva Bushidos size 42.5s (US 9.5). After wearing these for two months, including multiple day hikes, my heel had completely worn all the fabric and padding out of the heel cup. Looking into the shoe you would see the plastic frame of the heel cup through a hole the size of a quarter.
In both shoes I could usually tape my heel to prevent blisters, but the shoes and socks still wear out.

