SwaddleDesigns zzZipMe Sack™ is perfect when baby is ready to graduate from swaddling. zzZipMe Sack - wearable blanket features a clever 2-way zipper. The zipper 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! Featuring plush fuzzy fabric inside and out with soft satin trimmed edges. SwaddleDesigns zzZipMe Sacks have passed rigorous third party testing in the US and UK, and meet CPSIA requirements. Fuzzy Plush zzZipMe Sacks have 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. SwaddleDesigns zzZipMe Sack with exclusive zipper is a patent pending design. 100% Polyester. Proudly made in USA.