SwaddleDesigns zzZipMe Sack is perfect when baby is ready to graduate from swaddling. The zzZipMe Sack is a wearable blanket that features a clever 2-way zipper (patent pending design) opens from the bottom as well as the top. The zipper 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. This zzZipMe Sack has a TOG rating of 2.2 which is perfect for year round use and the TOG rating recommended for temperatures of 65 - 70 degrees F (the temperature range medical experts recommend for sleep environments). This 100% polyester wearable blanket is plush and fuzzy inside and out with soft satin trimmed edges. Machine washable and proudly made in the USA.