Non Mulsed Merino Wool w/ Antimicrobial Spandex Recycled Nylon Stay Up Rib Cuff Snug Fit Heel Arch Support Rib Knit Compression Ankle Rib Band Achilles, Calf. and Shin Cushion Toe and Heel Cushion Reinforced Ghost Seam Toe Box Fit: ASI FIT Weight: MIDWEIGHT Fabric: MERINO WOOL BLEND: 41.5% MERINO / 41.5% ACRYLIC / 15% NYLON / 2% SPANDEX S/M = US 5 - 8.5 L/XL = US 9 - 13