The generous 46" x 46" size grows with baby into the toddler years making it both the perfect swaddle and blanket. Crafted from a polyester/rayon blend, it's ideally soft with the perfect amount of stretch and durability. The fabric is lightweight and breathable so baby is comfortable yet cozy. Machine wash in cold water. For best results lay flat to dry but you may also tumble dry on low heat. Click on the swaddle demo link below to see how to properly swaddle your baby.