Gentle Start Breathable Crib MattressLullaby Earth breathable crib mattresses provide more airflow than traditional non breathable crib mattresses according to independent tests. They can also improve temperature regulation and reduce overheating. Our practical approach to breathability is effective without sacrificing hygiene. No clunky zippers or impossible clean ups. With Lullaby Earth, you get all the benefits without the drawbacks. How It Works The breathable cover is a 3