97% Rayon made from Bamboo, 3% Spandex 1.0 Tog Sleep Bag in Size XS Fully removable swaddle wrap attached to the sleep bag via Velcro, which allows for different positioning of the swaddle as baby grows. When used on its own after swaddling piece is removed, sleep bag is designed to safely fit a newborn up to 13 lbs. J-shaped double zipper on the sleep bag for convenient diaper changes Our Sleep Bag Swaddler is an all-in-one sleep system that comforts your baby from the newborn stage to the next. Made from our signature bamboo rayon, our patent-pending sleep bag swaddler functions as both a swaddle and a 1.0 sleep bag. The attached swaddle wrap features a Velcro closure for a secure and adjustable fit, and is fully removable once swaddling is no longer recommended. There’s also a removable elastic loop that is fastened with a snap closure that can be placed around the bottom of the sleep bag. The additional step of tightening the sleep bag helps for little ones who haven’t fully grown in to their new sleep bag yet. Underneath the wrap is our award-winning sleep bag. Disclaimer: Following safe swaddling practices, remove the wrap once your baby is 8 weeks old or able to roll over, whichever one comes first. The wrap is intended to only be used with its corresponding sleep bag in size XS.