Typically I keep my keen shoes for years before I wear them out.  I bought these as slippers.  I wear them every morning and every night, inside only.  I've had them for less than a season and the part near the heel is already wearing out/ripping.  The top wool is very fuzzy and no longer "neat" looking.  Thankfully they are slippers, and I only wear them inside because otherwise I would be too embarrassed to wear them.  However if you are planning on wearing them outside, think again.  They will not last.