100 COTTON SwaddleDesigns muslin sleeping sacks are made from premium cotton muslin so they are soft and gentle next to babys skin The open weave is naturally breathable and the cotton muslin gets softer with every wash FOCUS on SAFETY Designed by a nurse to help baby sleep better and safer nonweighted wearable blanket as recommended by the AAP SwaddleDesigns zzZipMe Sack was the first sleep sack designed with a fabric zipper guard to protect babys delicate skin INNOVATIVE The first and original baby sleep sack to feature a 2way zipper handy 2way zipper opens from the foot for easy access for diaper changes opens from the top making it easy to dress baby for sleep Easy in Easy out MULTIPLE SIZES With generous leg room SwaddleDesigns wearable blankets include three sizes Small 06 Months fits up to 28 inches Medium 612 Months fits up to 32 inches Large 1218 Months fits up to 35 inches SwaddleDesigns is LOVED for Stylish Quality Essentials Our muslin sleeping sack is perfect when baby is ready to transition from SwaddleDesigns Transitional Swaddle Sack Looks great after many uses Machine wash warm tumble dry low