The gloves are covered in a specially synthesized indicator dye that reacts to toxic substances by changing color. And the dye's chemical makeup can be tweaked to detect various toxins, like carbon monoxide or hydrogen sulfide.
The tricky part of developing the gloves has been engineering a color-changing dye that will adhere to the fabric even through washes, so that they don't lose their effectiveness and miss a potential risk. But once perfected the gloves could also be used to detect issues and contamination in food packaging facilities, or allow inspectors to easily find dangerous leaks in gas lines. More here.