Why is the SleepSack Wearable Blanket sleeveless? December 18, 2024 20:18 Updated It is sleeveless to reduce the chance of baby overheating and is easier to be worn with regular sleepwear underneath. Related articles Is the SleepSack Wearable Blanket chemically treated with flame retardant chemicals? How does the SleepSack Wearable Blanket help babies sleep safely? Why is the zipper upside down? When should I stop swaddling my baby? What is a TOG Value?