Parents, if you're looking for a safer alternative to loose blankets in the crib, this HALO Sleepsack is pretty much the gold standard! This is the original wearable blanket that's actually the #1 choice of hospital nurseries for promoting safe sleep. Made from super-soft polyester micro-fleece with a TOG rating of 1.0, it's perfect for moderate seasons or climates - you can always layer with warmer sleepwear if it gets colder. The fabric is plush on both sides and wicks away moisture to keep your baby comfortable. What's really great is the roomy sack design that's actually been recognized by the International Hip Dysplasia Institute as 'hip healthy' - it allows plenty of room for kicking and moving but can't be kicked off like regular blankets. The inverted zipper opens from the bottom for those middle-of-the-night diaper changes without fully undressing your little one. It's sleeveless to reduce overheating risk, and the arm and neck openings are specially sized for a safer, more secure fit. This medium size is designed for babies weighing 16-24 pounds, generally around 6-12 months old and 26-30 inches long. It's one of those baby products that just makes sense - you get peace of mind knowing your baby is sleeping safely, plus they stay warm and comfortable all night long. Seriously, if you're transitioning out of swaddles or just want a safer sleep solution, this Sleepsack is absolutely worth it!