Cork beats rubber on glass.

Yes, usually. Rubber mousepads can slide on glass because the rubber’s smooth surface doesn’t grip well on a slick, non‑porous material like glass. Cork, being porous and slightly textured, creates better friction against glass. It also doesn’t leave that sticky residue rubber can sometimes leave behind. If you’re using a glass desk, a cork‑based pad is the smarter choice.

Your mousepad will stay put.