When things heat up our Vertex 1/4 sock made with Coolmax stays cool. This is a great sock for runners who love a "barely there", ultra-light feeling sock that can put in the miles.

• Performance Fit: No slipping, no bunching, and no blisters.
• Fine Gauge Knitting: Unprecedented durability and our unique put it on, forget its on feel.
• Fast Action Wicking: Pulls moisture away from skin. Fast drying.
• Still made in Vermont, USA. Still unconditionally guaranteed for life.
• Gear Coop, GreatX, Go Bros, Lone Cone, Pike To Peak, Shoe Annex, Sole Provisions, and Dearborn Supply are the exclusive authorized retailers on Amazon.com. Darn Tough cannot verify the authenticity of product from other sellers

Performance Fit: No slipping, no bunching, and no blisters.Darn Tough