Our lightest, thinnest, waterproof sock. The original, ankle length, military-trusted Somerton sock. 100% waterproof, our lighter socks are perfect for running, hiking or any activity. Aquasealz(TM) membrane releases body-generated heat and moisture, while denying the entry of external elements. Natural bamboo lining for added comfort and moisture control. Essential waterproof socks for Summer. Handmade in our King&';s Lynn factory, Norfolk. Technology Outer - Extra-durable polycolon and nylon exterior, with 4-way stretch for the optimal fit. Mid-Section - Aquasealz(TM) membrane is 100% waterproof. Also effective in the release of perspiration. Interior - Soft bamboo rayon lining withdraws moisture away from the skin. A Seamless construction and elastic support on ankle prevent blisters forming. Materials and Construction Lovingly handmade in our King&';s Lynn factory under the guidance of Sealskinz veteran Robbie Greenacre, head of innovation and technical development. a Outer Layer - 61% PolycolonA(R), 38% Nylon, 1% Elastanea Middle Layer - AquasealzA(R) waterproof membranea Inner Layer - 75% Bamboo Rayon, 23% Nylon, 2% Elastane Care Guide a Wash at 40degC/105degFa Low Tumble Dry or Drip Drya Do Not Dry Clean, Iron, or Bleach