I work at a vet clinic, some days long hours on my feet (and knees). I chose Keen for the good arch support in shoes and the reinforced toes, as that what seems to wear out first in my line of work!  The first day I intended to wear them only half a day to let my feet "break in".  It turned out to be a real crazy day and I never changed shoes.  Never gave my feet a thought. I ended up wearing them 12 full hours!  I do have plantar faciitis and have to take care of what I put on my feet. It is true what some other ladies said about getting your foot in the shoe, it is a bit snug, but once in, it is very comfortable.  The heel sides kind of angle in a bit, causing that bit of difficulty. However, that helps the shoe stay on and "grip" or "cup" your foot and not be sloppy like some other slip on shoes!  So far I am LOVING MY KEENS! I did condition them with a great leather care product before wearing and they seem to be breaking in well.  I love the non skid soles with nobby grips. A great help when out in the elements.  Look pretty with my scrubs too!