aden + anais cozy sleeping bags are four layers of muslin, making babies comfortably warm during colder nights. aden + anais sleeping bags are designed to be worn over a baby’s pyjamas, ensuring a safe night’s sleep by removing the need for loose blankets, which can be dangerous. Muslin’s light, open weave allows a baby’s body temperature to regulate itself naturally helping to prevent overheating. aden + anais sleeping bags offer the ultimate in breathability and softness, as the more the more you wash them, the softer they get. Each sleeping bag zips from the bottom, making nappy changes easy, and a strip of muslin over the zipper by baby’s face provides extra comfort.