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For the skier who wants the minimum between their foot and boot, the PhD® Ski Ultra Light offers the benefits of Merino in a high-performance fit. Featuring Indestructawool™ technology for long-lasting wear, our 4 Degree™ elite fit system, mesh ventilation zones, and our signature Virtually Seamless™ toe for ultimate comfort in a ski boot, these socks are designed to keep you comfortable from first chair to backcountry escape.