This is an awesome swaddle, but my son grew out of it too quickly for us to use! A patented, game-changing design, the Swaddle Up™ makes longer sleep easy. The more natural Arms Up position lets babies access their hands to self-soothe. Product Details: 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. Our original jersey fabric is a soft, stretchy knit. Made to last, wears well and retains shape wash after wash. This 1.0 TOG Material is ideal for room temperatures between 68°F & 75°F. Single layer of fabric to reduce risk of overheating. Easy care: machine washable & tumble dryer friendly. Fabric content: 93% Cotton, 7% Elastane.