Our breathable, open weave, 100% cotton muslin zzZipMeSack is a wonderful option for warmer sleep environments. Our premium cotton muslin gets softer with every wash. Our innovative and handy 2-way zipper zips down from the top making it easy to place baby into sack and also zips up from the foot making diaper changes easy. Easy in. Easy out. SwaddleDesigns zzZipMe Sacks were the first and original to have a 2-way, 2 pull zipper on a baby sleep garment. Available Sizes · 0-6 Month: Fits up to 28 inches (71 cm) · 6-12 Months: Fits up to 32 inches (81 cm) · 12-18 Months: Fits up to 36 inches (91 cm) Highlights · 100% cotton muslin · 2-way zipper with 2 zipper pulls for ease of use