Made from an all-natural viscose bamboo blend, this fabric will keep baby cool yet cozy at the same time -- yep, it’s temperature regulating! The silky-smooth fabric is soft, breathable and comfortable, making it the perfect choice for the most sensitive baby skin. SPECIFICATIONS * 95% viscose from bamboo, 5% spandex * Two-way YKK zippers * Fold over mittens on newborn and 0-3 month sizing * Foot grips on 3-6 month + sizing * Ankle elastic keeps little feet in place * Zipper garage at neckline keeps zipper from rubbing against baby’s neck * Zipper lining prevents direct contact from zipper to baby’s tummy [no interfering with those fresh belly buttons] * Tag-free neckline * Machine wash cold, tumble dry low heat or hang to dry All Fall/Winter footed sleepers have upgrades made to foot grips and zippers.