Keep the cold out and the warmth in with Quietwear Men's 8 Inch Heat Retainer Hiking Socks. Flexible fit for long lasting comfort and soft knits enhanced with advanced thermal technology will keep toes toasty all day long.n Machine wash on gentle cycle, no bleach, tumble dry low heat. Imported.- 94% Acrylic, 5% Polyester, 1% Spandex Knit-Advanced thermal technology-Multiple color options available - OSFM (9-12)