Just Baby's non-slip pillow-sleeping bag gives your baby the comfort he needs for a restful sleep. It keeps it in good shape throughout the night, helping it breathe better and not straining its delicate spine, but it does not tighten or tighten it, leaving it just the space and freedom of movement it needs make small moves and make it comfortable. It also prevents it from rolling on the bed or swing and falling or knocking. The pillow fabric and material are soft and made of high quality materials so they can breathe and keep the temperature at the right level for your baby.