BUILT-IN CASE: Pinch to tuck the nipple away when you're on the go. Simply throw in your bag or tuck in a pocket and the nipple stays protected. Easy to protect the nipple when it's dangling from a clip. NIPPLE LOCKS IN EXTENDED POSITION: The firm lock gives parent and baby predictability and control of the nipple's position. The Pop & Go is NOT designed to pop when it drops. MADE FROM NATURAL AND SAFE MATERIALS: the modern, colorful pacifier is hypoallergenic, plastic-free, and made with 100% high grade silicone. It is one solid piece, and free from lead, PVC, BPA, latex, or phthalates EASY CARE AND EASY TO CLEAN: the pacifier is dishwasher and sterilizer safe. SOOTHING AND COMFORTABLE: the natural nipple shape is symmetrical and mimics breastfeeding for palette development. The 0-3 mo version features a soft nipple that is easy for newborns to manipulate. The 3+ version has a firmer nipple, designed to be bite-resistant for teething babies