100% Polyester Imported The original wearable blanket replaces loose blankets in the crib for a safer environment; the #1 choice of hospital nurseries to promote safe sleep Made from a super-soft micro-fleece minky dot fabric with a TOG rating of 1.5, offers just the right comfort for cooler seasons or climates; can be layered with warmer sleepwear for cooler temperatures Unique, roomy sack design recognized by the International Hip Dysplasia Institute as "hip healthy" - allows room for kicking but cannot be kicked off, so Baby stays warm all night Inverted zipper opens from the bottom for easy diaper changes; sleeveless to reduce the risk of overheating; arm and neck openings sized for a safer fit Available here in Large size designed for babies weighing between 22 and 28 pounds who are generally 12-18 months old and 30-35 inches long