They only puff up when you startle them.
Puffers are a type of jacket. But if you use your imagination, this sale could be about ANYTHING! Could be jackets, could be those cool fish that swell up when they feel threatened. Who can say what this sale is all about? All we know is you'll look well dressed whichever you're wearing. Yes, even if it's the fish. You'll just need to get a stretchy dinner jacket to wear over the top of it.