This is one of the most uncomfortable and painful pair of shoes I have bought. I usually wear size 5.5 with socks on, but my heels are sliding off. I worked my 8 hour nursing shift with this pair as it is (day 1) putting insoles (day 2), and heel pad in addition (day 3) the past 3 shifts. None of them helped me and my feet are very sore. I'd be dragging my feet to parking ramp at the end of shift. I usually don't have difficult time breaking in shoes and my feet have been in good condition. I bought this pair after reading several positive reviews, so I'm disappointed. Too bad it didn't work out for me.