That would be the sound of your expensive sunglasses slipping off your face and into the water. Sure, you can flail about like a madman trying to grab them as they sink to Davy Jones’ locker. But if you had the latest offering from FishGillz Sunglass Co., it wouldn’t be a problem. The company has just rolled out a line of floating sunglasses that are as stylish as they are practical. Available with Polarized lenses, the specs go for $50 a pair. (Kinda steep, considering we can buy shades from that guy over on 7th Avenue for two for $7. But they don’t float.) If they send us a demo pair (770 Broadway, NY 10003), we’ll throw them in the pool and let you know what happens.