Head, Shoulders, Knees, and Toes. Knees and Toes ! Sing and follow the movements of the beloved song with baby in a book that's INDESTRUCTIBLE! Original Indestructibles® are still the best: chew proof, rip proof, drool proof, and 100% washable--books that babies can really sink their gums into! Beloved by babies and their parents, Indestructibles® are built for the way babies "read" (i.e., with their hands and mouths) and are: · Rip Proof--made of ultradurable tightwoven material · Waterproof--can be chewed on, drooled on, and washed! · Emergent Literacy Tool--bright pictures and few or no words encourage dialogic reading · Portable--lightweight books can go anywhere, perfect for the diaper bag and for travel · Safe for Baby--meets ASTM safety standards.