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Despite this great potential, auxetic products have been slow to market.

Unlike a rubber band that narrows when stretched, the Airgami mask expands when pulled across the face, a feature of so-called auxetic materials.

It has an exclusive licensing agreement with Florida State University for the design, manufacturing and distribution of the first commercially available auxetic foam in a variety of medical devices and protective equipment.

Not only were these sheets auxetic - expanding in all directions when stretched - but they could snap easily back and forth between stretched and unstretched states.

Its has "auxetic" properties, make it good at absorbing impacts.