These shoes are comfy right out of the box. I work in surgery and am always looking for the perfect shoe. These have good support, side to side stability, and manage well on slick floors. Not having laces to drag the floor or come untied is an added bonus. The width of the shoe fit me very well but they do seem to run big length-wise. I did read some reviews saying the arch felt too far back on the foot but possibly because these are longer on me it seems to be in the perfect spot, or maybe that's just a matter of preference. At the end of my fourth day in a row of wearing to work I had experienced no rubs,  blisters or foot fatigue whatsoever without a "breaking in" period. Very happy with this purchase.