our warmer waterproof design mid-calf height (11”) three layers, securely bonded together throughout inner lining: expedition-weight double velour Polartec® Power Stretch® fleece between: our stretching waterproof, breathable MVT membrane outer shell: Nylon/Lycra®Spandex offering a durable , flexible, stretch covering stretch-to-fit to avoid uncomfortable sags and wrinkles, even in strenuous activity seamless design provides the ultimate in performance and comfort without annoying ridges and pressure points each sock is high-pressure tested to ensure that has no leaks. |