Philips Avent Natural Feeding Bottle is made of premium quality borosilicate glass which is thermal shock resistant, heat resistant and suitable for sterilisation.It has a wide breast shaped teat promotes a natural latch-on similar to the breast, making it easy for your baby to combine breast and bottle feeding.The teat has an ultra soft texture, designed to mimic the feel of the breast. Due to its unique shape, the bottle is easy to hold and grip in any direction for maximum comfort, even for baby's tiny hands.