New, open box. Never used. Breathable mesh crib liner. Fits four-sided slatted and solid back cribs. Safe and stylish for your baby. BreathableBaby, safety is first, last, and everything in between. That's why we have invested countless hours into medical and scientific research to make our products safer. We invented and perfected the breathable mesh liner. Unlike padded bumpers, our mesh liners keep little limbs safely inside without the risk of restricted airflow. The original breathable mesh liner with millions sold since 2002.