Crafted from a sophisticated blend of lambswool and durable spandex and nylon, these sharp navy blue bivouac lambs wool crew socks offer the ideal combination of comfort and versatility and are a wardrobe staple. The Bivouac model is made with silky lambswool for added comfort. They have a moderate heat rating, so are perfect for any occasion. These socks are made in Canada from 50% lambswool, 48% nylon, and 2% spandex. Their warmth rating is 2/4.