High quality, made in America thermal wool socks are very hard to find. These would pair perfectly with our Extreme Cold Temperature Mickey boots, or any boot. Wool is a great insulator, will dry quickly and has anti-bacterial properties. Per their military specs, these thermal wool socks cover your legs part way to the knee. 75% wool blended with 25% cotton for comfort. Size 10 should be comfortable in sizes 9 through 11. Size 12 should be comfortable 11 through 13. As with most surplus, styles may vary slightly. MADE IN USA. Unused condition. NSN# 8440-00-153-6717.