100% Waterproof, the SealSkinz Waterproof All Weather Mid Length Sock have been designed with premium materials & by bonding 3 layers together to make the most durable yet comfortable sock. These socks are 100% waterproof, windproof, and breathable, designed for colder climates. The inner lining features fine Merino Wool, providing exceptional insulation and temperature regulation, keeping your feet warm even in the harshest weather. With a remarkable Hydrostatic Head of >20,000mm, our socks have been tested and proven to stay waterproof under the most challenging conditions. We bond three layers together - Outer Layer (90% Nylon, 10% Elastane), Middle Layer (100% Hydrophilic Membrane), and Inner Layer (35% Merino Wool, 35% Acrylic, 23% Polyester, 3.5% Nylon, 3.5% Elastane) - to create an unparalleled waterproof and breathable experience. These socks are available in two stylish color combinations: Black / Grey and Black / Navy Blue. Easy care: machine wash, no re-waterproofing needed. Reliable for outdoor adventures in any weather.