100% Cotton. LIGHTLY WEIGHTED: Light pressure pad on the chest to gives the feeling of your gentle touch. The weights are filled with non-toxic poly beads (same as those used in children’s toys) and were created using physio-therapy standards to give just the right amount of pressure. Moms report longer sleep in 1-3 nights. VERSATILE & EASY TO USE: Perfect for picky sleepers who need a safe, effective alternative to swaddles and baby sleeping bags. Can be used on the go, in the crib, and everywhere in between, and durable snaps make diaper changes a breeze.