NIUNIU Made of high-quality raw materials: soft, breathable, insulating, absorbent, quick-drying, elastic and thickened. Keep Your Feet Warm: Suitable for various outdoor activities such as mountaineering, skiing, fishing, jogging, hunting, biking, hiking and fitness, working at camp, shoveling snow, etc. Socks come in universal sizes. Design: The bottom of the sock is designed with tourmaline, which automatically heats and relaxes your feet in cold weather. Function: Magnetic socks can relieve leg fatigue, relieve pain, regulate nervous system, heat yourself, remove moisture and odor, and remove swelling of legs and feet. GREAT FOR WINTER: As a warm gift for parents and friends, this is the best way to keep your feet warm in the harsh winter. Main fabric composition: CottonColor: Black, Red, White (optional) Packing list: 2 pairs of self-heating socks