The Twistshake bottle is ideal for use in combination with regular breastfeeding. Each bottle contains a practical dust container as well as a mixing net. The unique system called TwistFlow actively prevents baby colic and ensures a uniform flow. The bottle has a wide neck, making it easy to clean. It also has a grip-friendly design that retains heat. Free of BPA, BPS and BPF safe for both your baby and yourself Twistshake is the first company in the world to take these extra precautions so that your baby has the best possible start in life. CHARACTERISTICS PP-plastic - made of high quality polypropylene Nipple - made of silicone. Mixing net - actively dissolves milk powder. Anti-colic valve - Its unique system. Twistshake reduces baby colic. Smart container - prepare your meal at home and store it in the practical container. Two or more containers can be stacked. The wide neck makes stuffing and cleaning an easy task. Ergonomically designed easy to hold, for both parents and children.