Merino Wool Blend: 41. 5% Merino / 41. 5% Acrylic / 15% Nylon / 2% Spandex. Merino Wool with 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. Weight: Midweight. Fit_ASI Fit.