A swaddle sleep sack is like a mini sleeping bag for your newborn baby. Can be worn with the snap buttons closed to swaddle baby or open for arm mobility. It is a safe alternative for keeping your little one warm and cozy. 1.5 TOG, ideal room temperature 24-27C (75-80 degrees F). The fabric is a blend of organic cotton and TENCEL™ modal, ensuring that no pesticides or chemical fertilizers were used, and that the processes are sustainable.