It's the sound one makes while traversing dimensions.

And who, exactly, am I referring to? Why, The Flash, of course -- unless YOU can circle the globe in less than .00000077 seconds and create a devastating tornado with a twirling finger. 

Anyway, our Flash Kaboom Seatbelt Belt celebrates the Flash's incredibly loud super-speed with classic Flash images, classic Flash logos, sizzling lightning bolts, and those booming onomatopoeia.

And yes, this Flash belt is made from actual seatbelt material, so it's incredibly resilient and conveniently adjustable.

And, since we're dealing with an actual seatbelt, this Flash belt also features a solid-metal seatbelt buckle with push-button release.