Tongue-and-groove modular design allows for easy installation during any phase of construction;Molded-in shelves;Easy-to-clean, durable high-gloss finish;Innovative Dry-Block seal and channeled water containment system form watertight seams;Factory-installed Aging in Place backerboards for future grab bar installation;Must be installed with Performa 2 bath 71341110, 71341120, 71341112, or 71341122