Our Muslin Blankets Are a Must Have! Our muslins are made of 70% bamboo and 30% cotton, which makes them incredibly soft and breathable. The fact that they're open weave and light weight means there's more ventilation, so you'll be less likely to overheat. Muslin has a delicate but sturdy weave that gives it the flexibility to be tucked securely around your infant without being constricting.