I wore these all day right out of the box and my feet did not get tired or sore.  But I've had this luck with Softwalk shoes and boots with every pair I've ever purchased.  They do cost a little more, but for someone like me that has trouble with her very small feet with high arches, it's worth the little extra you pay.  The side zipper makes them easy to put on and take off.  I ordered a 6m which is my normal size.  I probably should have gotten a 6 1/2 but the 6 works with thin socks.  If you like to wear crew or thick socks, I'd definitely recommend ordering a 1/2 size larger than your normal size.