After baby has transitioned from swaddling, experts recommend a wearable blanket for sleep. The zzZipMe Sack features a handy 2-way zipper that makes our sleep sack easy to use.Easy to place baby in the sack when unzipped from the top and keeps baby warm during diaper changes when you zip up from the bottom. Award winning design features soft and stretchy cotton.Available Size:12-18 Months: Fits up to 36 inches (91 cm)HighlightsSoft and stretchy 100% cotton2-way zipper0.7 TOG for sleep environments of 72-78 degrees FMachine washableImported, Designed in Seattle