Mack Weldon Silver Extended Crew Dress Sock Color: Brable Grey Heather with subtle stripes Mack Weldon's silver fabric infuses super-fine Pima cotton with anti-odor SILVER, for a sock that keeps your feet comfortable and fresh in dress shoes. Anti-odor Ionic Cushioned footbed Extended crew length Stay-put pique cuffs 70% Pima Cotton / 14% Nylon/ 7% Ionic+® Silver / / 5% Polyester /4% Elastic Brand new.