The fibers respond to body weight for the right amount of support at each pressure point for infants and toddlers. The core is still breathable complemented by the open weave borders for a continual flow of fresh air. The dual sided feature has an ultra firm infant side to be used up to 12 months. After 12 months your toddler’s comfort is further enhanced by a plush layer of the same elasticized memory fibers that are softer for a pillow top feel.  The cover is made from the newest sleep technology available in the adult bedding market. This performance fabric is woven with special fibers that capture and retain coolness to help dissipate heat away from baby’s sleep area to prevent overheating. Great for toddler beds too. Your baby will be a Beautyrest fan for life