aden + anais® takes the chill out of cold wintery nights and air-conditioned rooms with our cozy plus sleeping bag. Your baby will sleep safe and sound in cushion-like comfort—making sleeptime not just cosy, but cozy plus. TOG rating of 2.5 and 100% cotton muslin shell and hypoallergenic polyester fill. Practical: bottom and side zippers for easy changes. Safe: eliminates loose blankets for a safer sleep. Comfy: gets softer with every wash. Exclusive prints: designed by us, just for you. TOG is a unit of measurement used to calculate the thermal resistance (warmth) of a product. See below for a helpful chart that explains which products and TOG rating is right for your baby based on the ambient temperature of the room.