ASI Advanced Sock Integration FitNon Mulsed Merino Wool With Antimicrobial SpandexStay Up Rib CuffLogo Embroidery On CuffSnug Fit HeelArch Support Rib KnitCompression Ankle Rib BandAchilles, Calf, And Shin CushionToe And Heel CushionReinforced Ghost Seam Toe BoxFit: ASI FITWeight: MIDWEIGHTFabric: MERINO WOOL BLEND: 41.5% MERINO / 41.5% ACRYLIC / 15% NYLON / 2% SPANDEXS/M = US 5 – 8.5L/XL =US 9 – 13