Soft and Breathable: 100% Cotton. 
Our sleep sack is super soft, lightweight and breathable! Perfect for warmer weather since it’s sleeveless and breathable. 
2-Way Zipper: With the inverted zipper,  can change diaper easily without removing baby from the sleep sack. Zipper protectors protect baby’s jaw and belly from scratches.
Check the size chart carefully for proper size! XS for 0-3 Months. S for 3-6 Months. M for 6-12 Months. L for 12-18 Months. XL for 18-24 Months.