The Natural Beginnings Organic Castor Oil Pack Wrap is an all-in-one wrap that is soft brushed organic cotton on the inside where you will pour your castor oil for absorption into your skin over your womb or liver area, and double layered BPA-free laminated polyester on the outside that is water/oil proof to prevent any mess. It is a generous size and includes elastic, adjustable straps to fit multiple sizes, and now has a zippered pocket to place a heat pack!