Size: Women's 5-9 Also fits: Men's 4-8 Women requiring size 8-13 can look at Men's styles. For those who love the traditional weight and feel of 'proper' wool socks, we have combined the superior heat-retaining and wicking properties of natural merino wool with modern fibers and innovative knitting technology to create a high performance sock for an outstanding balance of warmth, thickness, and durability - great for outdoor activities or spending long periods of time facing the elements. These Heat Holders® women's Millie LITE™ Merino Wool augmented thermal socks have a tog rating of 1.8, making them over 4 times warmer than basic cotton socks. The medium looped pile and soft brushed finish of the inner hold heat and cushion your feet for all-day warmth and comfort. A reinforced heel & toe provide extra protection for heavy use. 54% acrylic, 36% wool, 5% nylon, 4% polyester, 1% elastane Reinforced heel & toe 1 Pair Pack Soft brushed inner 1.8 tog rating Machine wash cold on gentle cycle Imported