Bambini Napsack Wearable Blanket Fleece Baby Sleeping Bag Comfortable Foot Box for a cozy sleeping experience! Made from 100% Polyester Fabric for Babies ages 0-6 Months Color : Cream ZIPPER from the BOTTOM UP - Change the baby from the bottom without unnecessarily bothering the baby. Sleeveless Napsack - Reduces chances of overheating and fits with most clothing styles underneath Wearable sack keeps baby safe securely wrapped, while baby sleeps safer in avoiding any crib danger.] The dying process involves Heat which is not compatible with the nylon zipper. This garment must be washed in cold/warm wash with a low heat dryer.