The costume helps soothe his aching muscles after filming strenuous action scenes according to his `Mission: Impossible - Ghost Protocol` co-star.
`Star Trek` and `Shaun of the Dead` actor Simon Pegg, 42, learned Tom`s secret while filming the movie.
He told Daily Star: "He had this special suit. You put it around the muscles that you`ve been working out and it ices everything. I mean, he`s 49 now - and he was working out so intensively that it was important for him to be able to actually move the next day.
"So we`d be in the make-up chairs and he`d have this little jacket thing on that would go `pffft` every now and then to ice his muscles.
"One day I was like: `I want to do your regime.` But when he told me exactly what it takes, I said: `F**k that, Tom.`"
But Simon admitted he was impressed by Tom`s drive and continued ambition.
`Rock Of Ages` star Russell Brand recently revealed that Tom is a joy to be around.
He told The Sun: "Tom is lovely. He`s like a big charismatic hurricane smashing through your life. It`s lovely to get attention from him, it`s lovely to hang out with him. He`s a beautiful, genuine, kind man.