Closes when dropped! The Keep-it-Kleen Pacifier from Raz-baby is the only pacifier with this special "stay clean" shield. When the pacifier is dropped, the shields automatically closes to keep the nipple clean! The shield also locks closed so the pacifier can be stored and the nipple stays clean. No more lost pacifier covers. The pacifier has a contoured shield design for maximum comfort; it flexes and shapes to fits baby's mouth perfectly. It has ventilation holes which allow air circulations to help prevent irritation to baby's delicate skin. Pacifier nipple is a soft, vented orthodontic silicone nipple.