These shoes are heavy duty and very well made and right out of the box they are stiff. I had blisters on my heels within the first hour because there were so stiff and the material in the back of the shoe I guess is a synthetic leather of some kind and is angled just right it digs into the skin on the back of my heel as I put weight on my foot, very uncomfortable. I remedied the problem for now with some no residual duct tape. To prevent the sharp edge of synthetic leather material from doing any more damage. Then there is the composite toe if you do a lot kneeling or work on the ground the composite toe has a tendency to dig into the top of your foot when you bend your foot to kneel. they are also bulky. tight spots are hard to get your foot  or they hang up on everything in which is kinda expected from these type of shoes.<br />  I'm hopping these shoes just need some breaking in. But the heel issue may never go away cause the material is very durable and I don't see it giving way as much as I do my skin. some of the work I do is industrial mechanizing on large machinery. lots of kneeling or squatting under or above large machinery and the shoes seem to be perfect for that type of work. All I can say I hope they break in soon or they will become retired to the back of my closet or for small heavy duty jobs that don't take long.<br />All day wearing maybe at a minimum for me. or I'm just not use to wearing this type of shoe. I have other KEEN shoes that are very comfortable and like very much. thats one reason I wanted to try these. So I'm kinda on the fence about them. They may work better as a boot, who knows.