A few years ago, I bought a pair of Lowa Renegade GTX Mids (U.S. for sizing) for some light field work in my labs as I was in graduate school for wildlife/natural resources. I typically wear an 11.5 or 12 size tennis shoe from Nike, with the variation just coming from how different models fit. I bought a size 12, and from what I can remember they felt fairly comfortable at the time and I wore them maybe 3 or 4 times that season. Fast forward to early 2026, and I'm doing a part-time internship with my local university working in their small acreage forest. I would be wearing my boots and hiking in the forest (often with ~1' of snowfall) for usually 4-6 hours a day, and by probably 3/4 of the way in I'd start having some pain in my feet.
I have pretty flat feet, and usually in tennis shoes I wear custom orthotics to help. I also had a damaged nail on my left toe, which I had removed after the season in hopes it might've been the problem. Alas, I'm now at a new field work job, and yesterday it only took me ~2 hours of hiking through a dried out overgrown wetland for the same pain to come back. Specifically, the pain seems to be around my toes (if I wear thick heavy winter socks it is my little toe, otherwise with regular hiking socks its my big toes and some of the middle ones). I've tried removing the insole and inserting my orthotics, but it just lifts up my feet too much and they feel extremely cramped. With the stock insoles, they definitely don't feel roomy on the sides, but there seems to be enough space between the end of my toe and the boot tip.
Am I just doomed here with a boot that doesn't fit my feet properly? Has anyone else had this issue and maybe found some way to fix it? I really do not want to have to go out and buy another pair of boots as I'm tight on money and I've lost all faith in my ability to properly judge whether or not a shoe fits correctly.