Ultra light weight, crew to wear under your hiking socks CoolMax® technology wicks moisture to transport perspiration away CoolMax® provides great breathability to further enhance its thermal insulation properties Smooth, flat toe seam Contents: 93% CoolMax® polyester, 6% nylon, 1% Lycra® spandex Add another layer of cold-weather foot protection with Fox River's liner socks. Styles vary from those made with merino wool, silk, polypropylene, CoolMax®, Thermolite® and X-STATIC® - The Silver Fiber™. All Fox River liners move moisture to keep feet dry and comfortable no matter what the outside conditions.