Includes organic cotton zippered cover - removable and machine washable. * Wool also helps regulate temperature & contributes to improved circulation * Hypo-Allergenic, Wool has a tendency to wick away excess moisture which can contribute to allergenic concerns * The perfect size Toddler Pillow for optimum comfort and proper spinal developement * Both the Organic Cotton and Organic Wool used are Highly Breathable, helping to create an "oxygen-rich" sleep environment