Trusted by athletes, adventurers, and even the British military, the Sealskinz Raynham Aquasealz Waterproof All-Weather Mid-Length Socks for Men keeps feet comfortably dry in the wettest conditions. The secret to their superior waterproof protection lies in their construction each sock boasts a waterproof membrane sandwiched between a durable Polycolon-blended exterior and high-performance merino-wool-blended inner. These membranes lock out water while allowing body heat and moisture to escape. Plus, the merino wool blend increases comfort, wicks sweat, and adds odor resistance. Outer is made of 62% Polycolon/29% nylon/9% elastane. Inner is made of 36% merino wool/36% acrylic/18% polyester/5% nylon/5% elastane. Machine wash. Imported.Manufacturer style #: 111000610. Outer: 62% Polycolon/29% nylon/9% elastane Inner: 36% merino wool/36% acrylic/18% polyester/5% nylon/5% elastane Waterproof socks that maintain breathability Durable Polycolon-blend outers Merino-wool-blend inners for comfort, moisture wicking, and odor resistance