Fox River Outdoor Wick Dry Alturas Ultra-Lightweight Liner Socks 93% polypropylene/6% Nylon/1% Spandex Made in US Avoid getting blisters during your favorite excursions with these Ultra-Lightweight liner socks These liner socks use our exclusive WICK dry technology to keep your feet dry Proven design to prevent the moisture build up that causes blisters Polypropylene moves moisture away from skin and helps resist the friction POLYPROPYLENE also provides warmth and comfort without added weight; made in USA Polypropylene moves moisture away from skin and helps resist the friction that causes blisters Smooth, flat toe seam Ultra-lightweight Crew length sock Polypropylene provides warmth and comfort without added weight