Made from polyethersulfone (PES), a material with very high resistance to impact & heat PHILIPS AVENT feeding bottles are guaranteed BPA-free. Fitted with a flexible valve to allow air to enter the bottle, thereby reducing the risk of colic in newborns. Supplied with slow-flow teats in extra soft silicon that mimic the shape of the breast to make the transition from breast to bottle easier. Additional teats sold on this site. Wide stable base. Always check the temperature of the food before feeding. Please note: this is a green star item, no extra discounts apply.