SealSkinz is known for its high-quality waterproof products. The long shaft of the Worstead socks provides ample coverage, and the Aquasealz membrane within the construction keeps your feet dry! The Worstead is right at home in cool conditions. The three layers of the construction are bonded together, so putting on the socks is hassle-free. - Seamless construction - Outer material is a durable blend of nylon (90%) and elastane (10%) (Polycolon) - Waterproof, breathable Aquasealz membrane in the structure - Lining material consists of high-quality merino wool (35%), warm acrylic (35%), breathable polyester (23%), durable nylon (3.5%), and elastic elastane (3.5%) - Handcrafted in the United Kingdom