Tom Holland was surprised to learn he had to wear a thong for Spider-Man: Homecoming.

The 21-year-old actor recently revealed he had to get used to the undergarments beneath his Spidey suit.

“All I have on under that costume is a thong. They brought them in on my first day, like, ‘Here are your thongs,’” Tom told ShortList.com. “I had serious misgivings – would my arsehole ever be the same again? But I had to get used to it. Even though I was thinking no way, no way!”

“You have to completely disrobe and then put a dressing gown on, but they’re very comfy ones, you can’t walk around in just a thong, can you imagine?” he also said. “And then you race across the lot to the toilet, then come back, get back into it – it’s such a mission.”

Spider-Man: Homecoming hits theaters on July 7.