100% Organic Cotton - Super soft, breathable, zero pollution, safe and healthy. Four types of thickness for you to choose: Single layer cotton; Double layer cotton;150g cotton filling; 350g cotton filling zip for easy dressing and diaper changes;The detachable sleeve design, adjust as needed.Perfect sack design allows room for kicking and cannot be kicked off at night. Washing Guide: Hand wash(max.86℉）; Do not bleach; Do not dry clean; Drip drying in the side. Size: Small is suitable for height 20"-28" ; Medium is suitable for 28"-36" ; Large is suitable for 36"-42"