Made from soft, 100% acrylic material. The soft feel of this hat is perfect for sensitive scalps because it won't itch or scratch. This hat provides total head coverage for those women with hair loss due to cancer, chemotherapy, alopecia, or other hair loss conditions. It is also a great choice for women without hair loss because it is so fashionable. It is one size fits most, but does offer some stretch to fit snuggly to the head.