The original, ankle length, military-trusted Wretham sock. 100% waterproof, our lighter socks are perfect for running, hiking or any activity. The Aquasealz(TM) membrane releases body-generated heat and moisture, while denying the entry of external elements. Natural bamboo lining for added moisture control. Handcrafted in the Sealskinz factory in Norfolk. A sock for warm, potentially wet weather.