Keep your noggin warm and look good to boot. Made with Alpin-woolâ"¢ Plus fabric, a wool/nylon blend exterior with soft fleece lining. TransActionâ"¢ headband for comfort and moisture management. Double-weave, stretch Cordura® face/Thermolite® polyester back and tuck-away earflaps. 21 5/8 circumference (SM/MD) or 23 1/4 circumference (LG/XL). 63% polyester, 26% wool, 11% nylon. Wash separately from other garments. Imported. Measurements: Circumference: 24 in Product measurements were taken using size SM/MD (6 7/8-7 1/8). Please note that measurements may vary by size.