Improve airflow in the crib! This 100% breathable crib mattress topper enhances air circulation around baby, creating a safer sleep environment while making the crib a softer, cushier place. What's unique: unlike conventional, solid foam mattress pads, it's made of airy layered mesh that enhances ventilation, keeping baby cooler and preventing overheating. Place under the fitted sheet. Lab tested for safety. Fits most standard cribs and toddler beds. Machine wash, line dry.