The sock you need. Featuring both an outer and inner fabric layer, the Monsoon socks are 100% waterproof. The DRYTEC outer layer is all about keeping your feet dry but the inner layer is what sets the Monsoon apart. The Merino blend inner makes them super comfortable. This sock performs no matter where your adventurous feet might take you. There's no limit! Outer 76% Nylon, 14% Lycra, 10% Polyester Inner: 50% Merino, 30%Nylon, 20% Acrylic Durable quick drying outer shell waterproof breathable DRYTEC membrane Inner merino liner for thermal performance Warm, dry, comfortable Certified Carbon Neutral Product Average Product Weight = 140g Outer 76% Nylon, 14% Lycra, 10% Polyester Inner: 50% Merino, 30%Nylon, 20% Acrylic Durable quick drying outer shell waterproof breathable DRYTEC membrane