About SNOO Sleep Sack 3-Pack of Sizes, used but excellent condition Includes three (3) SNOO Sacks in different sizes: 1 medium, 1 large, 1 XL The world’s first ever 5-second swaddle Attaches to SNOO with specially designed wings that help secure babies on the back Made from soft and cozy 100% organic cotton Double zipper that allows to zip from top or bottom for easy diaper changes Special inner arm bands and leg flap keep even little Houdinis bundled all night Extra-quiet adjustable fastener, so light sleepers don’t startle awake with diaper changes Breathable mesh at shoulders and waist to reduce overheating Perfect for healthy, growing hips (International Hip Dysplasia Institute seal of approval) Arm openings can unsnap to allow babies to sleep with arms out