The Fox River Women's Wick Dry Alturas Ultra-Lightweight Liner Socks are designed to be worn as a base layer under thicker hiking socks. These liner socks are made from a blend of polyester, nylon, and spandex, offering moisture-wicking properties and a snug fit. They help reduce friction and prevent blisters, while also providing additional insulation and comfort. The ultra-lightweight design ensures minimal bulk and maximum breathability. If you're looking for liner socks to enhance the performance and comfort of your hiking socks, the Fox River Women's Wick Dry Alturas Ultra-Lightweight Liner Socks are a great choice.