Philips Avent breast pads are mainly made of cotton and absorbent material. See below for a more detailed description.
What are my Philips Avent breast pads made of?
Material build up
Surface layer: Breathable non-woven tissue
Absorption layer: Cellulose Fluff pulp and Absorbent polymer with top and back tissue
Back layer: PE and non-woven laminated film and back release paper
All of the materials used are non-toxic and pose no health risk to you and your child.