The Vertex No Show Tab Ultra-Light stays in place so you can get moving. When the mercury rises, CoolMax comfort greets you like a cool wind at the summit. Weighing in at a mere 13 grams per sock, the Vertex is incredibly light but still incredibly strong. No slipping, blisters or hot spots, the superior wicking and ventilation makes you forget they're even on. And as always, Darn Tough backs up its tough promise with an unconditional lifetime guarantee.