This is my 4th pair of these shoes (and I also own several other Merrell shoes). The first pair have been walked to the point of destruction. The second pair (strangely) did not suffer this fate and was as comfortable as the first but did degrade a little earlier than expected (they lost waterproofing). My 3rd pair is still going strong though does not like wet metal (they are slippery as hell on metal manholes). 4th pair are playing nice so far and still as comfortable as ever (tho wet metal is still not a good place to walk). I walk "A LOT" and have several Merrell shoes. I would love to know how the development of these shoes happens - I have a VERY well used collection and although I love (LOVE) these shoes, there could always be improvements.