Breathable and Soft: The baby sleep sack is made of 100% high quality cotton, which is soft and elastic, protecting baby's sensitive skin. And the surface is designed with evenly hollowed dots, which is breathable without overheating, even in the mid summer, your baby will feel cozy in it. 2-in-1 Design: The baby sleep sack is designed with half-long sleeved and can be worn in two ways: the first, full hand wrap as a transition swaddle, allows baby to sleep more peacefully without worrying about their hands scratching their face; The second, open cuffs as a sleep sack, allows baby to try to grab things while playing to feel the outside world closely. 2-Way Zipper: The baby sleep sack is designed with two-way zip, making changing nappies easier, and the inverted zip opens from the bottom, which makes it easier for new mums to cope. Widen Hem and Zipper Cover: The baby sleep sack is equipped with widen hem, giving baby sufficient room hips and legs development, which is suitable for the growth and development of the baby's hip joint. Moreover, the zipper cover protects baby’s sensitive skin to avoid unnecessary scratching and squeezing. The baby sleeping bag needs gentle machine wash, with cold water and gentle washing, no matter how much you wash it, our baby blanket does not lose its shape. Please take care that softeners and bleach are avoided and dry at low temperature.