rubber crumbs

Small granules of recycled tires used to pad artificial turf athletic fields or playground surfaces. The crumbs are a bigger and softer than grains of sand. A good way to use recycled used tires.

"I could feel rubber crumbs flying around my legs when I ran the 40-yard dash in my flip-flops."

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crumb rubber

A rubber that has been in your wallet for far too long and is starting to crumble.

"Hey , Bae you ready for some sugar?"
"Ya, hang on."
"Shit, all I have left is this crumb rubber."
"It's cool Bae, this won't be my first kid."
"What?!?"