This slimline design uses a breathable 3D spacer mesh & an organic cotton mesh to form a taut protective liner around the inside perimeter of the cot. Unlike padded cot bumpers, the Bubba Blue Breathe Easy Cot Liner allows optimal air to flow through the cot's mesh. It will keep your little one's limbs and pacifiers safely inside the cot without the risk of restricted airflow. It's made of lightweight, breathe-thru mesh to prevent overheating. All sides facing inside the cot are Cotton Mesh, so it's soft, smooth and comfortable for baby to touch!