The SwaddleDesigns Transitional Swaddle Sack is designed for babies who prefer to sleep with their arms up, are starting to roll over, or can break out of a traditional swaddle. It features half-length sleeves with mitten cuffs that can be worn open or closed, allowing the baby to self-soothe or protecting them from facial scratches. Made from 100% soft stretchy cotton knit with a TOG rating of 0.7, it includes a 2-way zipper for easy diaper changes. The snug fitting and hip-healthy design supports the baby in a natural and flexed position, promoting better and safer sleep.