Skip Hop Air Flow Sleeping Bag are specially engineered to help babies sleep in style, safety and comfort. They have been carefully TOG tested. They are well designed with the correct neck and armhole opening sizes. On top of this, they have innovative underarm air vents which helps to ensure babies sleep safely and for longer. The beautiful Skip Hop designs are made from linen trim and soft 100% cotton resulting in luxury as well as peace of mind! All Skip Hop airflow Sleeping Bags come with a FREE durable nursery door hanger. The clever door hanger has a nursery thermometer and a reference guide for how to dress your baby depending on the temperature of the nursery and the TOG baby sleep bag used.