The TSA has received numerous bids for devices that scan passengers’ shoes as they wear them. One of the competing products is IDO Security’s Magshoe, which can be found in hundreds of airports and cruise ships around the world.

“As long as you’re still when you step onto the machine, it immediately reads the area from the soles of your shoes, midway up your calf. And then you step off the machine,” says Michael Goldberg, the president of the Israel-based company. “You’ll get a green or a red, which is a go/no-go signal.”

Morpho Detection, part of the France-based Safran group, is another company vying for the bid. Unlike the Magshoe, prototypes of its ShoeScanner can detect chemical compounds in addition to metal objects.

“It detects a wide variety of explosive and in fact, non-explosive, threats,” says spokesperson Steve Hill.