The Oslo wool knit watch cap features a no-itch acrylic headband liner and worsted wool outer shell for warmth and comfort. It has been a long time favorite with wigwam customers. It is also supported by wigwam and its 110+ year history and reputation as a quality family owned business that stands behind their products. This item is made in the USA and carries the wigwam 2-year guarantee. For more details visit www.wigwam.com