SealSkinz - Trekking Waterproof Sock - Olive Green are a pair of Water Proof socks, created in the UK by Seal Skinz, who specialise in making top quality socks for outdoor activities, such as Bike Riding, Mountain Climbing, Scrambling, Fishing and Dog Walking. The Sock externally is constructed from 91% Nylon, 9% Elastane, with an internal Hydrophilic Membrane constructed from 42% Merino Wool, 40% Acrylic, 16% Polyester, 1% Elastodiene, 1% Elastane. The Socks are built to be totally Waterproof, keeping your feed dry and warm even in damp conditions, whilst still protecting the user from Wind chill as well. The socks are extremely comfy, in part due to the Merino Wool Lining which has been specifically chosen for its soft feel. The material of the sock is Flexible and Highly Stretchable, and features Elasticised Ankle and Instep Support for long journeys or extended periods of use. This is the ultimate pair of socks for any Outdoor activities, keeping your feet dry and fresh even during the soggiest British weather.