1.0 TOG fabric is ideal for moderate temperatures, ideal for room temperatures between 68°F and 75°FUnique patented wings allow natural ARMS UP™ position, ARMS UP™ allows true SELF-SOOTHING™ = more sleepSingle layer of fabric to reduce risk of overheatingCertified 'hip-healthy' by the International Hip Dysplasia Institute allows recommended flexion for hips & legsTwin zipper for easy diaper changesNo loose layers to kick off or unravel during sleepSwaddle in seconds with no breakoutsSnug fit for secure feel, warmth and comfortProudly supporting First Candle and SIDS researchEasy care: machine wash on gentle, tumble dry on low