Darn Tough Vertex No Show Tab UltraLight Women's Socks 54% Nylon, 40% Merino Wool, 6% LycraSpandex Ultra-Light: Our lightest sock for race day or anyone looking for a lighter-than-air feel from a tougher than hell sock. No-Show Height: The toughest sock youll never see. When your shoes are on this sock is gone. Performance Fit: No slipping, no bunching, and no blisters. Fast Action Wicking: Pulls moisture away from skin. Fast drying. All Weather Performance: Cool in the summer, warm in the winter.