Mid weight cushioned sock. Merino wool cushioning provides shock absorption. Animicrobial, air vents to the upper to help keep feet cool. Arch grip section and Y heel for an optimum fit. Lycra for stretch and recovery. Flat toe seam construction to help prevent blisters. 100% Nylon leg sheds water and does not flap. 56% Merino wool, 41% Nylon, 3% Elastane (lycra)