... patent design!Material:Bottle: silicone, heat-resistant to 200, sterilizable.Nipple: cross cut silicone nipple, heat-resistant to 200, sterilizable.Twist Cap: polypropylene ... , sterilizable.Bottle Cap: polypropylene, heat-resistant to 120, sterilizable.Bottle sleeve: match with twist cap, polypropylene, heat-resistant to 120Features:1: Safe silicone material, colorless ...