I purchased these over a year ago and have just gotten around to reviewing the purchase.  I'm not wearing these to trek across the Sahara or whatever, but I have found this pair of Birkenstocks to be sturdy enough for my line of work.  I'm on my feet all day, and it's lovely to be comfortable in Birks.  Great addition to your Birkenstock collection!  I wear mine with knee-length skirts and light cardigans for spring and summer.  So pretty!