Angel Dear's sleep sack is made from 2 layers of muslin. The generous sack design allows room for kicking, but cannot be kicked off so baby stays warm all night. Unzips from the bottom for easy diaper changes. Made of 100% pure cotton muslin, pre-washed for softness, and suitable for all seasons. This sleep sack is a newborn essential, to wear layered with a onesie of sleeper. The double zipper makes for easy diaper changes. Comes in a gift box. Fits 0-6 months. 100% pre-washed cotton muslin.