Big difference. The football players get an endless supply of water and gatorade, plus they have the cool mist fans on the sideline.
When I was in the marching band 20-something years ago we got a styrofoam cup of water per half and an apple after halftime. We also marched in our full wool uniforms no matter what. They did let us take our coats and the marching hats(shakos) off in the stands at least, but had to put everything back on for halftime and for the post-game. Also understand, the band doesn’t start at the beginning of the game. They usually start three to four hours before the game with a warm up practice, then over to do a full show for an audience at the Recreation Center, then parade march through the parking lot into the stadium. A full game is usually something like a 7 or 8 hour day for them. And they aren’t scholarship athletes that get the full support of the athletic department behind them feeding and hydrating them with whatever they need.
I marched at the 2000 Eddie Robinson Kickoff Classic against Kansas State at Arrowhead Stadium, which was(and maybe still is) the earliest game in August that Iowa had ever played. That was the hottest I’ve ever been in my life, and I’ve gone backpacking in the New Mexico desert. They had us get off the busses in the parking lot, get changed into uniforms, then parade march around the tailgating lots to stop and play for one or two special groups out there before going into the stadium. It felt like we high-step marched for close to a mile by the time we got to the stadium. At that point we’d been going for 45-60 minutes straight with no break or water and they had us go straight into the pre-game show on the field. We had several students in the band keel over and pass out on the field during that show. When we came off the field during pregame the on field thermometer said something like 110. And there was no wind down at field level. Then they put us in the stands right behind the uprights of one end zone where there was absolutely no shade, so we just baked. Thankfully after a quarter smarter people realized they needed to let us get up into the concourse for shade if needed and also needed to get us a lot more water. Pretty much none of us had money on us, so we couldn’t go and buy drinks when we wanted, plus we were poor college students that couldn’t afford a bunch of stadium priced drinks just to stay hydrated.
The other thing that I left out, there were a lot of beer drinkers in the band back then, probably still are too. And with a home game yesterday they likely were doing beer band downtown the night before. I’m sure that didn’t help at all. I remember smelling some of the band members sweating the beer out in the stands on Saturday mornings my freshman year being a new experience for me.