Copper Socks Anti Bacteria Comfort-Crew Socks Dress-casual Socks 3-Pack 12% polyester Made in Korea ANTI BACTERIAL AND ANTI ODOR : No more smelly feet. Utilizes copper ion infusion technology that kills odor causing bacteria. Permanent and non-toxic. HAND-LINKED : Delicate and time-consuming manual hand-linked toes provide a secure, comfortable fit. ( Dress Casual socks only) MALLEOLUS ENCLOSING DESIGN : Provides comfort by enclosing the malleolus with cushioning piles, even when wearing hardy & safety shoes. ( Safety Comfortable only) ALL DAY COMFORT : Stay dry and comfortable. Allow your feet to breathe with the soft, moisture wicking, and lightweight design. PREMIUM MATERIALS : Made of 73% cotton, 20% polyester, 13% spandex, and 1% acrylic . Proudly and ethically made in Korea.