SealSkinz Thin Mid Length Running Socks - AW15 Nylon / Elastane Weather Protection - The socks commit to remaining totally waterproof and windproof. Merino Wool Lining - Transports excess moisture away from the feet, increasing comfort. Breathable - Allow cool air to circulate the interior. Elasticated Ankle and Insteps - Offer support and a comfortable fit. Calf Length Coverage