• Pair of heatless, less-mess, reusable Castor Oil Packs that come in 2 different options, small or large, to accommodate different breast sizes. Designed by a naturopathic doctor, the Chest Packs are made with an inner 100% organic cotton layer that touches the skin, an outer less mess layer of polypropylene, and a button/elastic to easily attach the packs inside a bra of your choice.