Brightly colored silicone sleeve provides a great grip and tactile experience during feeding;Bottle and sleeve can be boiled or put in the dishwasher together and can also go in the freezer, making breast milk storage simple;Silicone sleeve with measurements and stage 1 silicone nipple for ages 0-3 months;The entire product, including all components, is completely free of known toxins including BPA, phthalates, polycarbonates, and PVC