Swiftwick- VIBE ZERO | Socks Built for Running, Walking, All Day Comfort | Cushioned, Lightweight, Fast Dry No Show Socks SIGNATURE OLEFIN FIBER: Carefully selected high performance fiber that wicks moisture and will keep you dry and comfortable. High Olefin content in the footbed for optimum moisture control. CONTOURED COMPRESSION FIT: Designed to support the contours of your foot. No voids, bunching, or blisters. BREATHABILITY: A light, thin top to vent heat and keep the feet cool, while eliminating irritation. NO SHOW CUFF HIEGHT: Sits below the ankle with minimal extension above the shoe. Our most popular cuff height for running. MADE IN THE USA: Swift Socks are designed and crafted in the USA