This sleeping sack is crafted from pure cotton fabric soft and skin friendly with exceptional breathability to create a comfy sleeping space for babies. It meets the safety standards of the US Consumer Product Safety Commission ensuring worry free use for little ones. The two way zipper allows quick diaper changes without removing the sleep sack minimizing sleep disruption and a collar zipper cover and internal protective layer prevent skin friction while the widened bottom offers ample legroom for free movement. The sleep sack zipper automatically locks when fully closed to prevent your baby from kicking it open ensuring all night warmth retention and with its easy release feature simply lifting the zipper pull allows smooth one handed opening for effortless nighttime care. It is machine washable at low temperatures and the upgraded sewing craftsmanship ensures durability even after repeated washes.