The NEW Wooleator Pro features a flat toe seam and additional lycra throughout the sock, providing a closer fit. Like the original Wooleator, the Pro is a thin, low-bulk sock in a blend of USA Merino wool and Repreve® performance fiber, moisture-resistant and naturally antibacterial. The Wooleator Pro is equally comfortable for 4-season cycling or casual wear. Content: 40% Nylon, 29% Recycled Polyester, 29% Merino Wool, 1% Lycra