Luxuriously soft bamboo rayon Hypoallergenic microfiber fill that mimics the feel and insulating ability of luxury down. Genius easy access zipper for Potty or diaper changes. No need to undress. Just unzip the inseam zipper for easy no-hassle access & stay cozy 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. Hypoallergenic microfiber fill that mimics the feel and insulating ability of luxury down.