ThirtyTwo Men's Signature Merino Socks ASI Advanced Sock Integration Fit Non Mulsed Merino Wool With Antimicrobial Spandex Stay Up Rib Cuff Logo Embroidery On 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