The offered Borosilicate Baby Feeding Bottle Silicon Cover is made available by us in various colors. This feeding-bottle cover is made of silicone material, durable and soft. Hollow design with exquisite detail makes it practical, your baby will hold feeding bottle firmly. At the same time, it keeps the feeding-bottle from accident drop damage. Borosilicate glass is a type of glass that contains boron trioxide which allows for a very low coefficient of thermal expansion. It is a silicone protection for glass feeding bottles protects the bottles from scratches, cracks and splinters. The Borosilicate Baby Feeding Bottle Silicon Cover is very easy to use.