The glass bottle has wide neck for easy food filling and cleaning. The anatomical teat gives the real feeling of breastfeeding and always correctly positioned in the baby's mouth. The anti colic vents prevent air build up and swallowing during feeding. The ergonomic design gives you better gripping to feed in a comfortable and natural way. The glass does not absorb the smells, tastes or colors of food and beverages and is very clean. It is clinically tested and the colors used are natural and non toxic.