I bought my son a bunch of sleep sacs thinking he’s need them in his crib but he ended up sleeping with me so they all went unused. These sleep sacks are organic cotton which means breathable and adaptable fabric that is not only free or harmful pesticides, but also warm when room is colder and cool with good airflow when it’s warmer. 1.5 tog is great for fall, winter, and spring weather! Super cute print and I love that the zipper zips up so diaper changes are easy without having to remove the sleep-sack in the cold early morning hours or middle of the night..