Teko Women's Sin3rgi Organic Merino Wool Light Casual, Walking and Hiking Socks 18% nylon Designed for light hiking and everyday wear Organic, chlorine-free tekoMERINO wool is naturally wicking and insulating; recommended for all weather conditions Exceptional fit: Seamless toes, arch support, anatomical y-heel; narrower heel, tapered toe for women Reinforced with soft, durable tekoPOLY recycled polyester Made in USA