SwaddleDesigns cotton flannel zzZipMe Sack is a soft and cozy wearable blanket made from the same breathable, preshrunk 100% cotton flannel as our Ultimate Receiving Blankets. Experts recommend wearable blankets when babies are ready to graduate from swaddling. Our zzZipMe Sacks feature a 2-way zipper which zips down from the top, making it easy to place baby into sack, and also zips up from the bottom, keeping baby snugly warm during diaper changes. So easy! Featuring our Polka Dots design, this cotton zzZipMe Sack has a TOG rating of 0.7, which is best for temperatures of 72-78 degrees F, to keep baby cool in warmer weather. Machine washable and proudly made in the USA.