Why is the zipper upside down? December 18, 2024 20:18 Updated The zipper is inverted to allow you to unzip the SleepSack wearable blanket from the bottom for easy diaper changes Related articles How does the SleepSack Wearable Blanket help babies sleep safely? What is a TOG Value? Why is the SleepSack Wearable Blanket sleeveless?