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 How does the SleepSack Wearable Blanket help babies sleep safely? What is a TOG Value? How do I transition my baby from Swaddling to a SleepSack Wearable Blanket? Is the SleepSack Wearable Blanket chemically treated with flame retardant chemicals? Why is the zipper upside down?