From Philips Avent comes the Comfort Breast Shell Set which will help your keep you dry and comfortable between feedings. ? Collects excess breast milk when feeding or using a breast pump. ? Pack of 2 reusable cups. ? Helps keep moisture away from the nipple with contoured cups. ? Ventilated shells with holes protect sore or cracked nipples. ? Come with ultra-soft silicon backing cushions. ? 100% Silicone.