Andean Alpaca Yarn Thermo Regulating - Comfortable in Varying Temperatures 48% Alpaca, 41% Acrylic, 9% Nylon, 2% Spandex 200% Softer than Merino Wool 108 Needle Construction Moisture Wicking Anti Microbial - Minimizes Foot Odor Boot Length ( Shorter than Over the Calf, Taller than Anklet - Perfect for Every Boot) One Size Fits Most