How comfortable are these boots if you walk in them all the time during an 8-hour work day?

I am an auto mechanic working in a shop on concrete floors 8hrs a day.These boots are very comfortable & absolutely worth the money for my feet not to hurt at the end of the day.These boots are also very tough and very well made.I hope this helps others happy customer!

Are these suitable for summer use in terms of insulation and letting feet breathe?

I've been wearing my pair during a heat wave this past week in NYC that temps were around 101 and my feet felt fine. But these boots are a little heavier than others for summer wear.