The original, mid length, military-trusted Starston sock. Waterproof and breathable, the Starston thrives in cold environments. The Aquasealz(TM) membrane releases internal moisture, while denying the entry of water. Premium merino wool interior is soft and insulative, with natural odour-resistance. Built for cold, high-altitude pursuits. Technology Outer - Extra-durable nylon exterior, with 4-way stretch for an optimal fit. Mid-Section - Aquasealz(TM) waterproof membrane releases moisture vapour from inside the sock. Interior - Premium merino wool, with terry-loop knitting for extra comfort and sweat-wicking. Natural antimicrobial properties, stopping growth of odour-causing bacteria. A seamless construction, with elastic support on the ankle, providing a close fit. Materials and Construction Lovingly handmade in our Kings Lynn factory in Norfolk, to the highest possible standard. Accessories undergo an intensive testing process before coming to market. a Outer Layer - 90% Nylon, 10% Elastanea Middle Layer - AquasealzA(R) waterproof membranea Inner Layer - 35% Merino Wool, 35% Acrylic, 23% Polyester, 3.5% Nylon, 3.5% Elastane Care Guide a Wash at 40degC/105degFa Low Tumble Dry or Drip Drya Do Not Dry Clean, Iron, or Bleach