“Because the suit is tough to work in.

No one likes to hear actors that play superheroes complain about the suit.

Mostly the cowl was really tough to act in.

The Flash

Grant Gustin on ‘The Flash’.Colin Bentley/The CW

“It was just a moment I knew that I’d want to have,” he says.

“I felt really at peace that whole last episode, as I did for most of that season.

But wearing a superhero suit has its downsides, especially one as tight as the Flash’s.

The Flash

Grant Gustin in ‘The Flash’.Bettina Strauss/The CW

He laughs while adding, “The armpits were the weirdest spot.

It was the most painful, other than the face mask.

They really had to wedge it in there to get it so it wasn’t droopy.”

Something else that Gustin definitely won’t miss?

“Then they’ve got to fix the suit.

But there’s that moment you’re trapped in it.

Those were always moments I would feel my body instantly heat up and sweat.

I’m like, ‘No, no, no!'”

He laughs as he remembers how “it could be a nightmare at times.”

I would eat lunch in it.

I would be in it for 12 hours straight.

There were moments early on where I was like, ‘I’m doing this for how long?

Seven years?!’

The Flashseries finale airs Wednesday, May 24, at 8 p.m. ET/PT on the CW.