Trifecta has perfected the adult bib by selling a two-sided style that has fabric on one side and a waterproof material on the other side. The front of the bib is a blend of cotton and polyester, while the back is made of 100% waterproof PVC to keep clothing completely protected. The unique adult bibs from Trifecta are washable and disposable. Also, Trifecta's adult bibs are 18" by 36", which is more than big enough to fit most people.