The Moisture Control Boot sock from Columbia is made from a soft, polyester/ acrylic / wool blend with moisture wicking fibers that help keep feet dry and comfortable. Deep heel construction provides excellent fit and prevents slippage, Arch band for secure fit, Mesh venting for breathability, Comfort toe seam, Cushioned sole for comfort and absorbency. Soft Moc Mens Moisture Control Boot Sock -2pk/ Charcoal