Designed for cold temperatures, the Runton is insulative, waterproof and moisture-wicking. Hydrostopreinforces waterproofness, ensuring water does not trickle down the leg into the sock. A premium merino wool interior, with terry-loop knitting, has excellent thermal properties. Merino wool absorbs moisture away from the body, ensuring breathability. An engineered nylon blend exterior has similar moisture-wicking properties, highlighting the cohesiveness of fabrics within the garment. The Runtons Aquaselazmembrane is 100% waterproof, sitting in the mid-section of the sock. Essential for cold, wet weather pursuits: hiking, trekking, mountain biking. The Runton is a relative of the Starston.TechnologyOuterExtra-durable nylon exterior, with 4-way stretch for an optimal fit.Mid-SectionAquasealzwaterproof membrane releases moisture vapour from inside the sock.InteriorPremium merino wool and acrylic blend, with terry-loop knitting for extra comfort and sweat-wicking. Natural a