Underwear recommendations

Hello wondering what underwear you bigger folks use? I have been wearing some silk smooth boxer shorts from a brand called “Spyder” they do a cooling technology pair breathable and with a nice stretch, but unfortunately only go up to size XL I’m needing to size up now and I can’t find anything with similar compression, cotton underwear is terrible for breathability in my opinion,these have also helped with chaffing hence liking the smooth silky material when walking around

Thanks in advance folks