Underwear that doesn't ride up thighs
Basically what the title says.
All my life I've never worn underwear that didn't ride up my leg. I've tried loose boxers, boxer briefs that sit snug to my thighs, etc. They all eventually ride up my thighs, even if I walk for a little bit, so I constantly have to awkwardly pull them down mid walk/run. Won't try briefs because my thick thighs will instantly start to chafe with even slight amount of heat/moisture.
The problem is that now that I'm in the military I'm running a lot more and out in the field more, so on any sort of movement I'm constantly either pulling my boxers down or just raw dogging it and letting it chafe. I've tried a lot of underwear but mostly from Walmart/Target so nothing high end. At this point I don't mind shelling out for something I can just forget about.
The only thing that's worked are the spandex liners for my army PT shorts, but I thought I'd ask here before resigning myself to only wearing compression shorts from now on.
I'd also appreciate how to size underwear, I usually go slightly bigger than the waist measurement I wear but even that sometimes compresses my legs during movements like squatting. My waist is 32'-34' and my thighs are 25'.