Breathable Crib Mattress with Air Permeable Sleep Surface requires Passive Air-Flow base * Sleep Surface produced using Spacer Fabric An air permeable Medical Grade Fabric . * Air permeable Sleep Surface easily removed for laundering Wash in warm water Tumble dry on medium heat setting * Recommended by Pediatricians and Pediatric Sleep Disorder Specialists More comfortable sleep Several designs finishes and sleep surface colors * 1 year limited warranty