Allows baby to use natural feeding motion learned at the breast. SofTouch™ Peristaltic PLUS Nipple is 100% silicone, super soft and flexible to allow for natural and smooth tongue movement. Air Ventilation System (AVS™) reduces intake of gas, a potential cause of colic. Bottle shape is easy to hold. Specially designed roll-free bottle hoods. Bottle is made from Polypropylene (PP) material which is durable and lightweight. BPA Free