Thermosock Super size 35-38 gray shades Apollo 3 pair. Set of 3 pairs of warm gray thermal socks with wool, this sock is very comfortable, elastic, and features left/right indication. These quality tracking socks will keep your feet extra warm in the winter, also ideal to use as work socks or hiking socks. In 1 set there are 3 different colors socks. Composition thermo sock: 40% wool, 40% acrylic, 20% polyamide.