The original, 100% waterproof, windproof & breathable knee length sock. The inner lining is crafted from fine Merino Wool to insulate and regulate temperature making this perfect for use in colder weather conditions.Knee length for maximal coverage Waterproof - three layer construction for warmth, durability and waterproofing Comfort - Merino wool lining for moisture control, insulation and comfort Support - zonal elastication for added support Close fit - four way stretch for comfort and stretch fit Comfort - flat toe seams prevent rubbing Comfort - Footbed padding reduces pressure and absorbs shock