100% Cotton The original wearable blanket. Use over regular sleepwear to take the place of loose blankets. Designer prints. Quilted 100% cotton muslin, cotton jersey lining. TOG: 1.5. Size small fits 10-18 lbs; size medium fits 16-24 lbs. Two-way zipper allows for easy diaper changes and makes dressing easy; tab covers at top and bottom. Generous sack design allows room for kicking but cannot be kicked off, so baby stays warm all night. Sleeveless design reduces the risk of overheating. Recognized as Hip Healthy by the International Hip Dysplasia Institute. Back is Best embroidery reminds caregivers to place baby on his or her back. Premium, gift box packaging.