A great choice for sub temps in waders or any boot for that fact. Moisture-wicking intelligent merino wool with added mesh ventilation zones provide breathability that keeps feet dry and warm. The heavy cushioning assures comfort on any terrain. 82%Merino wool 5%nylon 3%spandex 10%polyster. Gray. Sizes M(5-9), L(9-12), XL(12-15).