"The Darn Tough Vert Micro Crew Ultra-Lightweight Running Socks for Men provides the performance your fast-moving feet need. These Darn Tough socks feature a performance fit that won't slip or bunch, preventing blisters and allowing you to focus on the views. True Seamless Toe technology creates a smooth feel, while soft Terry loops under the feet provide lasting rebound that's perfect for trail running. Made from 51% merino wool/45% nylon/4% Lycra spandex, these socks give you the moisture-wicking, breathable performance of merino wool fibers. Mfrs. limited lifetime warranty. Height: 8.5"". Machine wash. Imported.Manufacturer style #: 1066. 51% merino wool/45% nylon/4% Lycra spandex Strategic padding provides long-lasting rebound True Seamless Toe technology Performance fit fights blisters by preventing bunching and slipping Merino wool breathes well and wicks moisture"