Grey Ergobaby infant insert is made of cotton. This two-piece set includes the padded outer shell and a removable infant pillow. It has snap closures for attachment to a carrier. This insert is for the “Ergobaby Omni 360 All-Position Baby Carrier for Newborn to Toddler with Lumbar Support” carrier. I never used it because it was the wrong insert for my ergobaby carrier. Smoke and pet free home.