Unique patented wings allow natural ARMS UP position ARMS UP allows true SELF-SOOTHING = more sleep Swaddle in seconds with no breakouts 1.0 TOG fabric is ideal for moderate climates Single layer of fabric to reduce risk of overheating Certified "hip-healthy" design allows the recommended flexion for hips & legs Twin zipper for easy nappy changes No loose layers to kick off during sleep Available in 4 sizes: Newborn, Small, Medium & Large Fabric content: 93% Cotton, 7% Elastane