Fox River Trouser Men`s Lightweight Crew Socks, FR-4612, XLarge, Black 76% Merino wool, 22% nylon, 2% spandex. Memory-knit construction holds shape, wash after wash. Contoured rib top holds sock in place to eliminate slippage. Spandex compression zones add support and keep sock in place all day long. Fully cushioned sole absorbs shocks and insulates. Reinforced toe and heel add comfort and longer product life. Single pair pack.