Unique patented wings allow natural ARMS UP™ position ARMS UP™ allows true SELF-SOOTHING™ = more sleep Swaddle in seconds with no breakouts Twin zipper for easy diaper changes No loose layers to kick off during sleep Acknowledged as a hip-healthy product by the International Hip Dysplasia Institute; design allows the recommended flexion for hips & legs Our original jersey fabric is a soft, stretchy knit. Made to last, wears well and retains shape wash after wash This Light Weight Material is ideal for room temperatures between 68°F & 75°F Single layer of fabric to reduce risk of overheating Pairs perfectly with our Love to Dream™ layers for sleep and play All our garments are quality and performance tested Easy care: machine washable & tumble dryer friendly Available in 3 sizes: Newborn, Small & Medium Fabric content: 93% Cotton, 7% Elastane