Try this- Check with a bike shop for a bad bicycle inner tube. Cut a section about 2- 2.5 inches long. Stretch it, slip over the grips. Way back when, this was christened the "Glock Sock". Imitates a set of Hogue grips fairly well.
If it does not work, you are out of a blown out inner tube.
What we have heah is.... failure to communicate.