DETAILS Patented Full Contact Fit hugs the contours of your foot and stays put Full Merino wool cushion under foot and all around the leg Excellent thermal insulation and moisture control Nylon exterior provides maximum durability and abrasion resistance SPECS Best Use:   Hiking Fabric:  69% Merino Wool / 24% Nylon / 4% Polyester / 3% Lycra Weight:   Medium