For this dual-purpose sleeping bag for infants, we select high-elastic down cotton, double-sided long-velvet lining, moderate thickness, softness and comfort, making the baby warmer and more intimate. We select high-elastic down for this dual-purpose sleeping bag for infants Cotton, double-sided long-pile lining, moderate thickness, soft, comfortable, warmer and more intimate care for the baby.We specially designed a double zipper at the bottom of the sleeping bag, so that mothers can easily control the diaper change outdoors, especially in the cold winter, and no longer worry about the baby catching a cold. At the same time, it solves the problem of mothers getting up in the middle of the night to cover their babies with quilts, so that tired mothers can have enough sleep and sleep at ease. putHeart.This sleeping bag is an indispensable product for mothers to keep warm at home and when going out. It is suitable for various stroller models in the market and helps you travel easily.