How to pronounce “gravity boots” in English

I ask him what he was doing when the machine failed and he mumbles something about how I would never understand.I say "Try me." He looks down at his anti-gravity boots, which appear to be a couple of sizes too big, thengives me a look like "I'm a fourth grader, what do you want from me?" Dude, I say, you know you can't change the past.