... in the bottom balances the pressure inside and outside the bottle; more healthy, safer, no-toxic and odorless, heat ... EN .Top lid: the top lid of our feedig bottle is made od pp, resist tempreture up to 100 ... made of food-grade POLYCARBONATEone-time injection blow moulding; bottle is transparent, Light weight, smooth inside, easy to wash ... , loved by both the mother and the baby; no-toxic,safe, hygienic.