I used the Orville ultralights on my September moose hunt and really liked them. I spent all day in them and walked a little over 3 miles a day for the 10 day hunt. Hiked 10 miles one day because I shot a moose 1.7 miles from camp. I did, purposefully, hike in my waders and wading boots before going on the hunt to break in the boots and make sure I was comfortable being in the boots all day. I found the ultralights to be durable and as good of hiking/wading boot as I could find. No issues on my 10 day hunt. Spent all day every day in my waders and wading boots and I was comfortable, dry, and warm!
Over heating hiking in the waders is a real thing. Would hike to our spot with not much under the waders, get to spot and layer up to sit! And as mentioned before, putting on the cold waders and wading boots in the morning was something that kept me in my sleeping bag for an extra 5 min every morning!
after a short hike you warm up fast!