85% Acrylic, 14% Nylon, 1% Elastic Made in the USA No Closure closure Machine Wash Maximum comfort and protection for the longest matches or anyone who wants maximum comfort and protection Features Thorlo legendary padding in the heel, forefoot, sidewalls, and over the toes to protect against the forces inside your shoe High durability fibers embedded in the forefoot and toebox area to resist wear Padding is clinically shown to reduce blisters, moisture, pain, and pressure Anatomical design consistent with natural contours of foot helps promote a better fit Exclusive Thor-Lon fibers wick moisture to keep your feet dry Fibers are chosen for performance and durability resulting in a sock that wears for years Low profile toe seam won't rub or irritate feet Show more