The only thing cozier: the womb. Down Alternative fill wrapped in silky soft bamboo rayon keeps your little nugget secure while Gunamuna one-of-a-kind wonder zip keeps them covered, even during diaper changes. So get ready to sleep a lot. Like, a lot a lot. Scientific research shows that sleeping under an evenly distributed weight, from shoulder to toe, soothes baby into a deeper sleep cycle. Being gently cocooned in a comforting weight increases serotonin & relaxation, and naturally reduces anxiety by giving the same all-over sensation as a full-on giant cuddle.