The soles of the Muck Excursion Pro wear very comfortably. They are roughly 6mm thick give a lot of extra cushion and keeping your feet comfortable all day.
The interior features their Xpress Cool lining that mixes a spandex like material with their inner lining to not only fit comfortably but also wick sweat and moisture off of your feet and into other parts of the boot so your feet stay dry.
It makes this a great rain boot for the summer. But I wore mine a lot when the weather was cool this spring and also this fall when it’s been a lot cooler than usual. I actually think because your feet don’t sweat in them it helps your feet stay warm in wool socks.