20% spandex THX4COPPER INFUSED FABRIC : 2 Pairs.This great running socks made of THX4COPPER fabric which is patented copper infused fabric, anti-odor for over 96 hours, while keeping the feet dry and fresh all day. Great for Running, Hiking, Cycling, Half- Marathon IMPROVED GRADUATED COMPRESSION TECHNOLOGY: The new developed cushion level helps it deliver the right compression to the most needed area, keep the arch stable and protects the heel from rubbing/chaffing/blistering, the C type heel construction prevents the sock slip down into the shoe. THE UNIQUE AIR MESH DESIGN: Mesh Design on top of socks transfer maximum air flow to the feet, helps your feet breathing freely and keep them dry and cool in most tough condition. ENHANCED PROTECTION FOR THE TOE AND HEEL: Unlike the common running socks, THX4COPPER socks reinforced the toe and heel, protect the toe from possible injuries and provide best protection from blisters. SOLD IN 2 PAIRS, YOUR FEET WILL THANK YOU ! Composition: 70% Nylon, 20% Spandex, 10% Copper Nylon.