Convenient 2-Way Zipper: The double-zipper function not only makes it easy to put on and off, but also allows for quick nappy changes at night without waking the baby. The interior zipper protectors prevent any scratches to your baby's skins, ensuring your beloved one safe and comfortable. Tightening Waist for Better Sleep: This swaddle sack brings baby a slight sense of restraint, just like mom's womb makes baby feel familiar and secure. Plus, it reduces your baby's unexpected movements, making it easier for them to fall asleep in this swaddle. Widened Hem for Hip Healthy: Compared to other swaddles, this transitional swaddling features an extra wide hem. The large room allows baby to kick or wiggle legs freely, which promotes the development of the baby's legs and hip. Great Transition Sleep Sack: Unique arms design promotes self-soothing by allowing babies to sleep in their preferred natural position. In addition, a slight sense of enclosure can effectively prevent the startle reflex. As your baby sleeps better, you can get more sleep too. Lightweight and Soft Material: ZIGJOY baby swaddle is made of 100% cotton, which is super soft, skin-friendly and breathable. Tog Rating 0.5 for room temperature 75-81?/24-27?. Ideal for summer or wearing with body suit, keeping your baby warm but not overheated.