Set of 4 pairs copper infused fiber socks; Great for athlete, physical worker or old age people; Provides easier movement with joint and muscle support; Made up of 5% copper, 65% cotton, and 30% elastic fiber; Breathable fabric that controls odor and keeps feet dry; Copper ions blend eliminates the growth of odor causing microbes on the fabric; Special manufacturing ensures the copper fibers will not easily wash out or quickly wear away; Warm in winter and breathable in summer;