NWOT Size Chart in Pictures Cushioned heel and toe Compression helps provide relief from aches, pains and muscle soreness; compression assists with recovery time of muscles Patented Copper Znergy technology: copper and zinc infused Premium anti-odor technology: Tommie Copper's patented copper technology reduces odor causing bacteria on the fabric; anti-odor technology remains in the fabric for up to 50 washes when using regular liquid detergent Patented fabric with wicking, helping to keep your feet dry Content: Ankle 91% polyester/5% spandex/4% other fiber; Over-the-Calf 91% polyester/6% spandex/3% other fiber