The cool resilient surfaces soothe and stimulate sore gums safely and stays colder, longer than water filled teethers! While colorful shapes stimulate your baby visually, the raised, offset surfaces assist in the eruption of new teeth by gently massaging your infant’s gums. This Nûby™ teether also features areas filled with pûrICE™. This teether can be placed in the refrigerator and the pûrICE™ will remain colder longer than water filled teethers!