Carl, some long while ago you mentioned something for under the steps in an AGP. Plumber's vinyl? Plumber's mat? Plumber's something . . . and I can't remember.

We have to relocate the steps due to the washout directly next to their original location. The old Yoga mat I had been using is pretty ratty now, after all these years, and I'd like to replace it. What is the material you mentioned?